Adds support for BUD-10 Blossom URIs

amethyst/src/main/java/com/vitorpamplona/amethyst/AppModules.kt

@@ -25,6 +25,8 @@ import android.content.Context
 import androidx.security.crypto.EncryptedSharedPreferences
 import coil3.disk.DiskCache
 import coil3.memory.MemoryCache
+import com.vitorpamplona.amethyst.commons.model.NoteState
+import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.accountsCache.AccountCacheState
 import com.vitorpamplona.amethyst.model.nip03Timestamp.IncomingOtsEventVerifier
@@ -45,6 +47,7 @@ import com.vitorpamplona.amethyst.service.images.ImageLoaderSetup
 import com.vitorpamplona.amethyst.service.location.LocationState
 import com.vitorpamplona.amethyst.service.notifications.PokeyReceiver
 import com.vitorpamplona.amethyst.service.okhttp.DualHttpClientManager
+import com.vitorpamplona.amethyst.service.okhttp.DualHttpClientManagerForRelays
 import com.vitorpamplona.amethyst.service.okhttp.EncryptionKeyCache
 import com.vitorpamplona.amethyst.service.okhttp.OkHttpWebSocket
 import com.vitorpamplona.amethyst.service.playback.diskCache.VideoCache
@@ -54,11 +57,15 @@ import com.vitorpamplona.amethyst.service.relayClient.RelayProxyClientConnector
 import com.vitorpamplona.amethyst.service.relayClient.authCommand.model.AuthCoordinator
 import com.vitorpamplona.amethyst.service.relayClient.notifyCommand.model.NotifyCoordinator
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.RelaySubscriptionsCoordinator
+import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.EventFinderQueryState
+import com.vitorpamplona.amethyst.service.relayClient.reqCommand.user.UserFinderQueryState
 import com.vitorpamplona.amethyst.service.relayClient.speedLogger.RelaySpeedLogger
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.BlossomServerResolver
 import com.vitorpamplona.amethyst.service.uploads.nip95.Nip95CacheFactory
 import com.vitorpamplona.amethyst.ui.screen.AccountSessionManager
 import com.vitorpamplona.amethyst.ui.screen.UiSettingsState
 import com.vitorpamplona.amethyst.ui.tor.TorManager
+import com.vitorpamplona.quartz.nip01Core.core.Address
 import com.vitorpamplona.quartz.nip01Core.relay.client.INostrClient
 import com.vitorpamplona.quartz.nip01Core.relay.client.NostrClient
 import com.vitorpamplona.quartz.nip01Core.relay.client.accessories.RelayLogger
@@ -73,6 +80,7 @@ import com.vitorpamplona.quartz.nip05DnsIdentifiers.namecoin.DEFAULT_ELECTRUMX_S
 import com.vitorpamplona.quartz.nip05DnsIdentifiers.namecoin.ElectrumXClient
 import com.vitorpamplona.quartz.nip05DnsIdentifiers.namecoin.NamecoinNameResolver
 import com.vitorpamplona.quartz.nip05DnsIdentifiers.namecoin.TOR_ELECTRUMX_SERVERS
+import com.vitorpamplona.quartz.nipB7Blossom.BlossomServersEvent
 import com.vitorpamplona.quartz.utils.Log
 import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.CoroutineScope
@@ -80,6 +88,10 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.onCompletion
+import kotlinx.coroutines.flow.onStart
+import kotlinx.coroutines.flow.transform
 import kotlinx.coroutines.launch
 import java.io.File
 
@@ -137,16 +149,6 @@ class AppModules(
             scope = applicationIOScope,
         )
 
-    // manages all relay connections
-    val okHttpClientForRelays =
-        DualHttpClientManager(
-            userAgent = appAgent,
-            proxyPortProvider = torManager.activePortOrNull,
-            isMobileDataProvider = connManager.isMobileOrNull,
-            keyCache = keyCache,
-            scope = applicationIOScope,
-        )
-
     // Offers easy methods to know when connections are happening through Tor or not
     val roleBasedHttpClientBuilder = RoleBasedHttpClientBuilder(okHttpClients, torPrefs.value)
 
@@ -191,6 +193,15 @@ class AppModules(
             applicationIOScope,
         )
 
+    // manages all relay connections
+    val okHttpClientForRelays =
+        DualHttpClientManagerForRelays(
+            userAgent = appAgent,
+            proxyPortProvider = torManager.activePortOrNull,
+            isMobileDataProvider = connManager.isMobileOrNull,
+            scope = applicationIOScope,
+        )
+
     // Connects the NostrClient class with okHttp
     val websocketBuilder =
         OkHttpWebSocket.Builder { url ->
@@ -268,6 +279,44 @@ class AppModules(
             scope = applicationIOScope,
         )
 
+    fun subscribedFlow(
+        address: Address,
+        account: Account,
+    ): Flow<NoteState> {
+        val note = cache.getOrCreateAddressableNote(address)
+
+        val userSub = UserFinderQueryState(note.author ?: cache.getOrCreateUser(address.pubKeyHex), account)
+        val noteSub = EventFinderQueryState(note, account)
+
+        return note
+            .flow()
+            .metadata.stateFlow
+            .onStart {
+                sources.userFinder.subscribe(userSub)
+                sources.eventFinder.subscribe(noteSub)
+            }.onCompletion {
+                sources.eventFinder.unsubscribe(noteSub)
+                sources.userFinder.unsubscribe(userSub)
+            }
+    }
+
+    val blossomResolver =
+        BlossomServerResolver(
+            loggedInUsers = { listOfNotNull(sessionManager.loggedInAccount()?.pubKey) },
+            blossomServers = { addressesToSubscribe ->
+                val account = sessionManager.loggedInAccount() ?: return@BlossomServerResolver listOf()
+                addressesToSubscribe.map { address ->
+                    subscribedFlow(address, account).transform {
+                        val event = it.note.event as? BlossomServersEvent
+                        if (event != null) {
+                            emit(event)
+                        }
+                    }
+                }
+            },
+            httpClientBuilder = roleBasedHttpClientBuilder,
+        )
+
     // Organizes cache clearing
     val trimmingService = MemoryTrimmingService(cache)
 
@@ -298,7 +347,12 @@ class AppModules(
     fun contentResolverFn(): ContentResolver = appContext.contentResolver
 
     fun setImageLoader() {
-        ImageLoaderSetup.setup(appContext, { diskCache }, { memoryCache }) { url ->
+        ImageLoaderSetup.setup(
+            app = appContext,
+            diskCache = { diskCache },
+            memoryCache = { memoryCache },
+            blossomServerResolver = blossomResolver,
+        ) { url ->
             okHttpClients.getHttpClient(roleBasedHttpClientBuilder.shouldUseTorForImageDownload(url))
         }
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/model/nipB7Blossom/BlossomServerListState.kt

@@ -70,9 +70,9 @@ class BlossomServerListState(
 
     val flow =
         getBlossomServersListFlow()
-            .map { normalizeServers(it.note) }
-            .onStart { emit(normalizeServers(blossomListNote)) }
-            .flowOn(Dispatchers.IO)
+            .map {
+                normalizeServers(it.note)
+            }.flowOn(Dispatchers.IO)
             .stateIn(
                 scope,
                 SharingStarted.Eagerly,

amethyst/src/main/java/com/vitorpamplona/amethyst/service/images/BlossomFetcher.kt

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.images
+
+import androidx.compose.runtime.Stable
+import coil3.ImageLoader
+import coil3.Uri
+import coil3.annotation.ExperimentalCoilApi
+import coil3.fetch.FetchResult
+import coil3.fetch.Fetcher
+import coil3.network.CacheStrategy
+import coil3.network.ConcurrentRequestStrategy
+import coil3.network.ConnectivityChecker
+import coil3.network.NetworkFetcher
+import coil3.network.okhttp.asNetworkClient
+import coil3.request.Options
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.BlossomServerResolver
+import okhttp3.Call
+import kotlin.coroutines.cancellation.CancellationException
+
+@Stable
+class BlossomFetcher(
+    private val options: Options,
+    private val data: Uri,
+    private val blossomServerResolver: BlossomServerResolver,
+    private val networkFetcher: (url: String) -> Fetcher,
+) : Fetcher {
+    override suspend fun fetch(): FetchResult? {
+        println("BlossomFetcher: starting $data")
+        return try {
+            val urlResult = blossomServerResolver.findServers(data.toString())
+            println("BlossomFetcher: finished $data to ${urlResult?.serverUrl}")
+            networkFetcher(urlResult?.serverUrl ?: data.toString()).fetch()
+        } catch (e: Exception) {
+            if (e is CancellationException) throw e
+            println("BlossomFetcher: cancelled or error: $e $data")
+            null
+        }
+    }
+
+    @OptIn(ExperimentalCoilApi::class)
+    class Factory(
+        val blossomServerResolver: BlossomServerResolver,
+        val networkClient: (url: String) -> Call.Factory,
+    ) : Fetcher.Factory<Uri> {
+        private val connectivityCheckerLazy = singleParameterLazy(::ConnectivityChecker)
+
+        override fun create(
+            data: Uri,
+            options: Options,
+            imageLoader: ImageLoader,
+        ): Fetcher? {
+            println("BlossomFetcher: PreFactory $data")
+            if (!isApplicable(data)) return null
+
+            println("BlossomFetcher: Factory $data")
+
+            return BlossomFetcher(options, data, blossomServerResolver) { url ->
+                NetworkFetcher(
+                    url = url,
+                    options = options,
+                    networkClient = lazy { networkClient(url).asNetworkClient() },
+                    diskCache = lazy { imageLoader.diskCache },
+                    cacheStrategy = lazy { CacheStrategy.DEFAULT },
+                    connectivityChecker = lazy { connectivityCheckerLazy.get(options.context) },
+                    concurrentRequestStrategy = lazy { ConcurrentRequestStrategy.UNCOORDINATED },
+                )
+            }
+        }
+
+        private fun isApplicable(data: Uri): Boolean = data.scheme?.lowercase() == "blossom"
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/service/images/ImageLoaderSetup.kt

@@ -43,6 +43,7 @@ import coil3.svg.SvgDecoder
 import coil3.util.Logger
 import coil3.video.VideoFrameDecoder
 import com.vitorpamplona.amethyst.isDebug
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.BlossomServerResolver
 import com.vitorpamplona.quartz.utils.Log
 import okhttp3.Call
 
@@ -63,6 +64,7 @@ class ImageLoaderSetup {
             app: Context,
             diskCache: () -> DiskCache,
             memoryCache: () -> MemoryCache,
+            blossomServerResolver: BlossomServerResolver,
             callFactory: (url: String) -> Call.Factory,
         ) {
             SingletonImageLoader.setUnsafe(
@@ -78,6 +80,7 @@ class ImageLoaderSetup {
                         add(VideoFrameDecoder.Factory())
                         add(Base64Fetcher.Factory)
                         add(BlurHashFetcher.Factory)
+                        add(BlossomFetcher.Factory(blossomServerResolver, callFactory))
                         add(Base64Fetcher.BKeyer)
                         add(BlurHashFetcher.BKeyer)
                         add(OkHttpFactory(callFactory))

amethyst/src/main/java/com/vitorpamplona/amethyst/service/okhttp/DualHttpClientManager.kt

@@ -26,16 +26,12 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
+import okhttp3.Call
 import okhttp3.OkHttpClient
+import okhttp3.Request
 import java.net.InetSocketAddress
 import java.net.Proxy
 
-interface IHttpClientManager {
-    fun getHttpClient(useProxy: Boolean): OkHttpClient
-
-    fun getCurrentProxyPort(useProxy: Boolean): Int?
-}
-
 class DualHttpClientManager(
     userAgent: String,
     proxyPortProvider: StateFlow<Int?>,
@@ -79,18 +75,16 @@ class DualHttpClientManager(
         } else {
             defaultHttpClientWithoutProxy.value
         }
+
+    fun getDynamicCallFactory(useProxy: Boolean) = DynamicCallFactory(useProxy, this)
 }
 
-object EmptyHttpClientManager : IHttpClientManager {
-    val rootOkHttpClient by lazy {
-        OkHttpClient
-            .Builder()
-            .followRedirects(true)
-            .followSslRedirects(true)
-            .build()
-    }
-
-    override fun getHttpClient(useProxy: Boolean) = rootOkHttpClient
-
-    override fun getCurrentProxyPort(useProxy: Boolean) = null
+/**
+ * the okhttp can change on the manager without affecting other systems.
+ */
+class DynamicCallFactory(
+    val useProxy: Boolean,
+    val manager: DualHttpClientManager,
+) : Call.Factory {
+    override fun newCall(request: Request): Call = manager.getHttpClient(useProxy).newCall(request)
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/service/okhttp/DualHttpClientManagerForRelays.kt

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.okhttp
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
+import okhttp3.OkHttpClient
+import java.net.InetSocketAddress
+import java.net.Proxy
+
+class DualHttpClientManagerForRelays(
+    userAgent: String,
+    proxyPortProvider: StateFlow<Int?>,
+    isMobileDataProvider: StateFlow<Boolean?>,
+    scope: CoroutineScope,
+) : IHttpClientManager {
+    val factory = OkHttpClientFactoryForRelays(userAgent)
+
+    val defaultHttpClient: StateFlow<OkHttpClient> =
+        combine(proxyPortProvider, isMobileDataProvider) { proxy, mobile ->
+            factory.buildHttpClient(proxy, mobile)
+        }.stateIn(
+            scope,
+            SharingStarted.WhileSubscribed(1000),
+            factory.buildHttpClient(proxyPortProvider.value, isMobileDataProvider.value),
+        )
+
+    val defaultHttpClientWithoutProxy: StateFlow<OkHttpClient> =
+        isMobileDataProvider
+            .map { mobile ->
+                factory.buildHttpClient(mobile)
+            }.stateIn(
+                scope,
+                SharingStarted.WhileSubscribed(1000),
+                factory.buildHttpClient(isMobileDataProvider.value),
+            )
+
+    fun getCurrentProxy(): Proxy? = defaultHttpClient.value.proxy
+
+    override fun getCurrentProxyPort(useProxy: Boolean): Int? =
+        if (useProxy) {
+            (getCurrentProxy()?.address() as? InetSocketAddress)?.port
+        } else {
+            null
+        }
+
+    override fun getHttpClient(useProxy: Boolean): OkHttpClient =
+        if (useProxy) {
+            defaultHttpClient.value
+        } else {
+            defaultHttpClientWithoutProxy.value
+        }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/service/okhttp/IHttpClientManager.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.okhttp
+
+import okhttp3.OkHttpClient
+
+interface IHttpClientManager {
+    fun getHttpClient(useProxy: Boolean): OkHttpClient
+
+    fun getCurrentProxyPort(useProxy: Boolean): Int?
+}
+
+object EmptyHttpClientManager : IHttpClientManager {
+    val rootOkHttpClient by lazy {
+        OkHttpClient
+            .Builder()
+            .followRedirects(true)
+            .followSslRedirects(true)
+            .build()
+    }
+
+    override fun getHttpClient(useProxy: Boolean) = rootOkHttpClient
+
+    override fun getCurrentProxyPort(useProxy: Boolean) = null
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/service/okhttp/OkHttpClientFactory.kt

@@ -20,9 +20,10 @@
  */
 package com.vitorpamplona.amethyst.service.okhttp
 
-import android.os.Build
-import com.vitorpamplona.quartz.utils.Log
-import okhttp3.Dispatcher
+import com.vitorpamplona.amethyst.service.okhttp.OkHttpClientFactoryForRelays.Companion.DEFAULT_IS_MOBILE
+import com.vitorpamplona.amethyst.service.okhttp.OkHttpClientFactoryForRelays.Companion.DEFAULT_SOCKS_PORT
+import com.vitorpamplona.amethyst.service.okhttp.OkHttpClientFactoryForRelays.Companion.DEFAULT_TIMEOUT_ON_MOBILE_SECS
+import com.vitorpamplona.amethyst.service.okhttp.OkHttpClientFactoryForRelays.Companion.DEFAULT_TIMEOUT_ON_WIFI_SECS
 import okhttp3.OkHttpClient
 import java.net.InetSocketAddress
 import java.net.Proxy
@@ -32,53 +33,16 @@ class OkHttpClientFactory(
     keyCache: EncryptionKeyCache,
     val userAgent: String,
 ) {
-    companion object {
-        // by picking a random proxy port, the connection will fail as it should.
-        const val DEFAULT_SOCKS_PORT: Int = 9050
-        const val DEFAULT_IS_MOBILE: Boolean = false
-        const val DEFAULT_TIMEOUT_ON_WIFI_SECS: Int = 10
-        const val DEFAULT_TIMEOUT_ON_MOBILE_SECS: Int = 30
-
-        private fun isEmulator(): Boolean =
-            Build.FINGERPRINT.startsWith("generic") ||
-                Build.FINGERPRINT.lowercase().contains("emulator") ||
-                Build.MODEL.contains("google_sdk") ||
-                Build.MODEL.lowercase().contains("droid4x") ||
-                Build.MODEL.contains("Emulator") ||
-                Build.MODEL.contains("Android SDK built for x86") ||
-                Build.MANUFACTURER.contains("Genymotion") ||
-                (Build.BRAND.startsWith("generic") && Build.DEVICE.startsWith("generic")) ||
-                "google_sdk" == Build.PRODUCT ||
-                Build.HARDWARE.contains("goldfish") ||
-                Build.HARDWARE.contains("ranchu") ||
-                Build.HARDWARE.contains("vbox86") ||
-                Build.HARDWARE.contains("nox") ||
-                Build.HARDWARE.contains("cuttlefish")
-    }
-
-    val logging = LoggingInterceptor()
+    // val logging = LoggingInterceptor()
     val keyDecryptor = EncryptedBlobInterceptor(keyCache)
 
-    val myDispatcher =
-        Dispatcher().apply {
-            if (!isEmulator()) {
-                maxRequestsPerHost = 10
-                maxRequests = 1024
-            } else {
-                maxRequestsPerHost = 5
-                maxRequests = 256
-                Log.i("OkHttpClientFactory", "Emulator detected, using default maxRequests: 64.")
-            }
-        }
-
     private val rootClient =
         OkHttpClient
             .Builder()
-            .dispatcher(myDispatcher)
             .followRedirects(true)
             .followSslRedirects(true)
             .addInterceptor(DefaultContentTypeInterceptor(userAgent))
-            .addNetworkInterceptor(logging)
+            // .addNetworkInterceptor(logging)
             .addNetworkInterceptor(keyDecryptor)
             .build()
 

amethyst/src/main/java/com/vitorpamplona/amethyst/service/okhttp/OkHttpClientFactoryForRelays.kt

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.okhttp
+
+import android.os.Build
+import com.vitorpamplona.quartz.utils.Log
+import okhttp3.Dispatcher
+import okhttp3.OkHttpClient
+import java.net.InetSocketAddress
+import java.net.Proxy
+import java.time.Duration
+
+class OkHttpClientFactoryForRelays(
+    userAgent: String,
+) {
+    companion object {
+        // by picking a random proxy port, the connection will fail as it should.
+        const val DEFAULT_SOCKS_PORT: Int = 9050
+        const val DEFAULT_IS_MOBILE: Boolean = false
+        const val DEFAULT_TIMEOUT_ON_WIFI_SECS: Int = 10
+        const val DEFAULT_TIMEOUT_ON_MOBILE_SECS: Int = 30
+
+        private fun isEmulator(): Boolean =
+            Build.FINGERPRINT.startsWith("generic") ||
+                Build.FINGERPRINT.lowercase().contains("emulator") ||
+                Build.MODEL.contains("google_sdk") ||
+                Build.MODEL.lowercase().contains("droid4x") ||
+                Build.MODEL.contains("Emulator") ||
+                Build.MODEL.contains("Android SDK built for x86") ||
+                Build.MANUFACTURER.contains("Genymotion") ||
+                (Build.BRAND.startsWith("generic") && Build.DEVICE.startsWith("generic")) ||
+                "google_sdk" == Build.PRODUCT ||
+                Build.HARDWARE.contains("goldfish") ||
+                Build.HARDWARE.contains("ranchu") ||
+                Build.HARDWARE.contains("vbox86") ||
+                Build.HARDWARE.contains("nox") ||
+                Build.HARDWARE.contains("cuttlefish")
+    }
+
+    val myDispatcher =
+        Dispatcher().apply {
+            if (!isEmulator()) {
+                maxRequestsPerHost = 10
+                maxRequests = 1024
+            } else {
+                maxRequestsPerHost = 5
+                maxRequests = 256
+                Log.i("OkHttpClientFactory", "Emulator detected, using default maxRequests: 64.")
+            }
+        }
+
+    private val rootClient =
+        OkHttpClient
+            .Builder()
+            .dispatcher(myDispatcher)
+            .followRedirects(true)
+            .followSslRedirects(true)
+            .addInterceptor(DefaultContentTypeInterceptor(userAgent))
+            .build()
+
+    fun buildHttpClient(
+        proxy: Proxy?,
+        timeoutSeconds: Int,
+    ): OkHttpClient {
+        val seconds = if (proxy != null) timeoutSeconds * 3 else timeoutSeconds
+        return rootClient
+            .newBuilder()
+            .proxy(proxy)
+            .connectTimeout(Duration.ofSeconds(seconds.toLong()))
+            .readTimeout(Duration.ofSeconds(seconds.toLong() * 3))
+            .writeTimeout(Duration.ofSeconds(seconds.toLong() * 3))
+            .build()
+    }
+
+    fun buildHttpClient(
+        localSocksProxyPort: Int?,
+        isMobile: Boolean?,
+    ): OkHttpClient =
+        buildHttpClient(
+            buildLocalSocksProxy(localSocksProxyPort),
+            buildTimeout(isMobile ?: DEFAULT_IS_MOBILE),
+        )
+
+    fun buildHttpClient(isMobile: Boolean?): OkHttpClient =
+        buildHttpClient(
+            null,
+            buildTimeout(isMobile ?: DEFAULT_IS_MOBILE),
+        )
+
+    fun buildTimeout(isMobile: Boolean): Int =
+        if (isMobile) {
+            DEFAULT_TIMEOUT_ON_MOBILE_SECS
+        } else {
+            DEFAULT_TIMEOUT_ON_WIFI_SECS
+        }
+
+    fun buildLocalSocksProxy(port: Int?) = Proxy(Proxy.Type.SOCKS, InetSocketAddress("127.0.0.1", port ?: DEFAULT_SOCKS_PORT))
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/diskCache/VideoCache.kt

@@ -23,13 +23,12 @@ package com.vitorpamplona.amethyst.service.playback.diskCache
 import android.annotation.SuppressLint
 import android.content.Context
 import androidx.media3.database.StandaloneDatabaseProvider
+import androidx.media3.datasource.DataSource
 import androidx.media3.datasource.cache.CacheDataSource
 import androidx.media3.datasource.cache.LeastRecentlyUsedCacheEvictor
 import androidx.media3.datasource.cache.SimpleCache
-import androidx.media3.datasource.okhttp.OkHttpDataSource
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import okhttp3.OkHttpClient
 import java.io.File
 
 @SuppressLint("UnsafeOptInUsageError")
@@ -60,18 +59,18 @@ class VideoCache {
     }
 
     // This method should be called when proxy setting changes.
-    fun renewCacheFactory(client: OkHttpClient) {
+    fun renewCacheFactory(dataSourceFactory: DataSource.Factory) {
         cacheDataSourceFactory =
             CacheDataSource
                 .Factory()
                 .setCache(simpleCache)
-                .setUpstreamDataSourceFactory(OkHttpDataSource.Factory(client))
+                .setUpstreamDataSourceFactory(dataSourceFactory)
                 .setFlags(CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR)
     }
 
-    fun get(client: OkHttpClient): CacheDataSource.Factory {
+    fun get(dataSourceFactory: DataSource.Factory): CacheDataSource.Factory {
         // Renews the factory because OkHttpMight have changed.
-        renewCacheFactory(client)
+        renewCacheFactory(dataSourceFactory)
 
         return cacheDataSourceFactory
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/playerPool/CustomMediaSourceFactory.kt

@@ -22,28 +22,26 @@ package com.vitorpamplona.amethyst.service.playback.playerPool
 
 import androidx.media3.common.MediaItem
 import androidx.media3.common.util.UnstableApi
-import androidx.media3.datasource.okhttp.OkHttpDataSource
+import androidx.media3.datasource.DataSource
 import androidx.media3.exoplayer.drm.DrmSessionManagerProvider
 import androidx.media3.exoplayer.source.DefaultMediaSourceFactory
 import androidx.media3.exoplayer.source.MediaSource
 import androidx.media3.exoplayer.upstream.LoadErrorHandlingPolicy
-import com.vitorpamplona.amethyst.Amethyst
+import com.vitorpamplona.amethyst.service.playback.diskCache.VideoCache
 import com.vitorpamplona.amethyst.service.playback.diskCache.isLiveStreaming
-import okhttp3.OkHttpClient
 
 /**
  * HLS LiveStreams cannot use cache.
  */
 @UnstableApi
 class CustomMediaSourceFactory(
-    okHttpClient: OkHttpClient,
+    videoCache: VideoCache,
+    dataSourceFactory: DataSource.Factory,
 ) : MediaSource.Factory {
     private var cachingFactory: MediaSource.Factory =
-        DefaultMediaSourceFactory(
-            Amethyst.instance.videoCache.get(okHttpClient),
-        )
+        DefaultMediaSourceFactory(videoCache.get(dataSourceFactory))
     private var nonCachingFactory: MediaSource.Factory =
-        DefaultMediaSourceFactory(OkHttpDataSource.Factory(okHttpClient))
+        DefaultMediaSourceFactory(dataSourceFactory)
 
     override fun setDrmSessionManagerProvider(drmSessionManagerProvider: DrmSessionManagerProvider): MediaSource.Factory {
         cachingFactory.setDrmSessionManagerProvider(drmSessionManagerProvider)

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/playerPool/ExoPlayerBuilder.kt

@@ -23,23 +23,25 @@ package com.vitorpamplona.amethyst.service.playback.playerPool
 import android.content.Context
 import androidx.annotation.OptIn
 import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DataSource
 import androidx.media3.exoplayer.ExoPlayer
 import com.vitorpamplona.amethyst.model.MediaAspectRatioCache
+import com.vitorpamplona.amethyst.service.playback.diskCache.VideoCache
 import com.vitorpamplona.amethyst.service.playback.playerPool.aspectRatio.AspectRatioCacher
 import com.vitorpamplona.amethyst.service.playback.playerPool.positions.CurrentPlayPositionCacher
 import com.vitorpamplona.amethyst.service.playback.playerPool.positions.VideoViewedPositionCache
 import com.vitorpamplona.amethyst.service.playback.playerPool.wake.KeepVideosPlaying
-import okhttp3.OkHttpClient
 
 @OptIn(UnstableApi::class)
 class ExoPlayerBuilder(
-    val okHttp: OkHttpClient,
+    val videoCache: VideoCache,
+    val dataSourceFactory: DataSource.Factory,
 ) {
     fun build(context: Context): ExoPlayer =
         ExoPlayer
             .Builder(context)
             .apply {
-                setMediaSourceFactory(CustomMediaSourceFactory(okHttp))
+                setMediaSourceFactory(CustomMediaSourceFactory(videoCache, dataSourceFactory))
             }.build()
             .apply {
                 addListener(AspectRatioCacher(MediaAspectRatioCache))

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/playerPool/MediaSessionPool.kt

@@ -29,8 +29,8 @@ import androidx.core.net.toUri
 import androidx.media3.common.MediaItem
 import androidx.media3.common.Player
 import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DataSource
 import androidx.media3.datasource.DataSourceBitmapLoader
-import androidx.media3.datasource.okhttp.OkHttpDataSource
 import androidx.media3.exoplayer.ExoPlayer
 import androidx.media3.session.MediaSession
 import com.google.common.util.concurrent.Futures
@@ -41,7 +41,6 @@ import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
-import okhttp3.OkHttpClient
 
 class SessionListener(
     val session: MediaSession,
@@ -57,7 +56,7 @@ class SessionListener(
  */
 class MediaSessionPool(
     val exoPlayerPool: ExoPlayerPool,
-    val okHttpClient: OkHttpClient,
+    val dataSourceFactory: DataSource.Factory,
     val appContext: Context,
     val reset: (MediaSession, Boolean) -> Unit,
 ) {
@@ -101,7 +100,7 @@ class MediaSessionPool(
                         DataSourceBitmapLoader
                             .Builder(context)
                             .setExecutorService(DataSourceBitmapLoader.DEFAULT_EXECUTOR_SERVICE.get())
-                            .setDataSourceFactory(OkHttpDataSource.Factory(okHttpClient))
+                            .setDataSourceFactory(dataSourceFactory)
                             .build(),
                     )
                     setId(id)

amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/service/PlaybackService.kt

@@ -20,35 +20,69 @@
  */
 package com.vitorpamplona.amethyst.service.playback.service
 
+import android.net.Uri
 import androidx.annotation.OptIn
+import androidx.core.net.toUri
 import androidx.media3.common.C
 import androidx.media3.common.Player
 import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DataSource
+import androidx.media3.datasource.DataSpec
+import androidx.media3.datasource.ResolvingDataSource
+import androidx.media3.datasource.okhttp.OkHttpDataSource
 import androidx.media3.exoplayer.ExoPlayer
 import androidx.media3.session.MediaSession
 import androidx.media3.session.MediaSessionService
 import com.vitorpamplona.amethyst.Amethyst
+import com.vitorpamplona.amethyst.service.okhttp.DynamicCallFactory
+import com.vitorpamplona.amethyst.service.playback.diskCache.VideoCache
 import com.vitorpamplona.amethyst.service.playback.pip.BackgroundMedia
 import com.vitorpamplona.amethyst.service.playback.playerPool.ExoPlayerBuilder
 import com.vitorpamplona.amethyst.service.playback.playerPool.ExoPlayerPool
 import com.vitorpamplona.amethyst.service.playback.playerPool.MediaSessionPool
 import com.vitorpamplona.amethyst.service.playback.playerPool.SimultaneousPlaybackCalculator
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.BlossomServerResolver
 import com.vitorpamplona.quartz.utils.Log
-import okhttp3.OkHttpClient
+import kotlinx.coroutines.runBlocking
 
 class PlaybackService : MediaSessionService() {
     private var poolNoProxy: MediaSessionPool? = null
     private var poolWithProxy: MediaSessionPool? = null
 
     @OptIn(UnstableApi::class)
-    fun newPool(okHttp: OkHttpClient): MediaSessionPool =
-        MediaSessionPool(
+    fun newPool(
+        videoCache: VideoCache,
+        okHttpClient: DynamicCallFactory,
+        blossomServerResolver: BlossomServerResolver,
+    ): MediaSessionPool {
+        val dataSourceFactory = OkHttpDataSource.Factory(okHttpClient)
+
+        val resolvingDataSourceFactory: DataSource.Factory =
+            ResolvingDataSource.Factory(
+                dataSourceFactory,
+                ResolvingDataSource.Resolver { dataSpec: DataSpec ->
+                    val originalUri: Uri = dataSpec.uri
+                    val scheme = originalUri.scheme
+                    if (scheme != null && blossomServerResolver.canResolve(scheme)) {
+                        val serverUrl =
+                            runBlocking {
+                                blossomServerResolver.findServers(originalUri.toString())
+                            }
+                        if (serverUrl != null) {
+                            return@Resolver dataSpec.withUri(serverUrl.serverUrl.toUri())
+                        }
+                    }
+                    dataSpec
+                },
+            )
+
+        return MediaSessionPool(
             exoPlayerPool =
                 ExoPlayerPool(
-                    ExoPlayerBuilder(okHttp),
+                    ExoPlayerBuilder(videoCache, resolvingDataSourceFactory),
                     poolSize = SimultaneousPlaybackCalculator.max(applicationContext),
                 ),
-            okHttpClient = okHttp,
+            dataSourceFactory = resolvingDataSourceFactory,
             appContext = applicationContext,
             reset = { session, keepPlaying ->
                 (session.player as ExoPlayer).apply {
@@ -58,6 +92,7 @@ class PlaybackService : MediaSessionService() {
                 }
             },
         )
+    }
 
     @OptIn(UnstableApi::class)
     fun lazyPool(proxyPort: Int): MediaSessionPool {
@@ -65,22 +100,23 @@ class PlaybackService : MediaSessionService() {
             // no proxy
             poolNoProxy?.let { return it }
 
-            // creates new
-            return newPool(Amethyst.instance.okHttpClients.getHttpClient(false)).also { poolNoProxy = it }
-        } else {
-            poolWithProxy?.let { pool ->
-                // with proxy, check if the port is the same.
-                val okHttp = Amethyst.instance.okHttpClients.getHttpClient(true)
-                if (okHttp.proxy != null && okHttp.proxy == pool.exoPlayerPool.builder.okHttp.proxy) {
-                    return pool
-                }
+            val okHttpClient = Amethyst.instance.okHttpClients.getDynamicCallFactory(false)
+            val videoCache = Amethyst.instance.videoCache
+            val blossomServerResolver = Amethyst.instance.blossomResolver
 
-                pool.destroy()
-                return newPool(okHttp).also { poolWithProxy = it }
-            }
+            // creates new
+            return newPool(videoCache, okHttpClient, blossomServerResolver).also { poolNoProxy = it }
+        } else {
+            poolWithProxy?.let { return it }
 
             // creates brand new
-            return newPool(Amethyst.instance.okHttpClients.getHttpClient(true)).also { poolWithProxy = it }
+            // proxy port can change without affecting the pool because
+            // the choice of okhttp is resolved in newCall
+            val okHttpClient = Amethyst.instance.okHttpClients.getDynamicCallFactory(true)
+            val videoCache = Amethyst.instance.videoCache
+            val blossomServerResolver = Amethyst.instance.blossomResolver
+
+            return newPool(videoCache, okHttpClient, blossomServerResolver).also { poolWithProxy = it }
         }
     }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/RelayProxyClientConnector.kt

@@ -23,7 +23,7 @@ package com.vitorpamplona.amethyst.service.relayClient
 import com.vitorpamplona.amethyst.model.torState.TorRelayEvaluation
 import com.vitorpamplona.amethyst.service.connectivity.ConnectivityManager
 import com.vitorpamplona.amethyst.service.connectivity.ConnectivityStatus
-import com.vitorpamplona.amethyst.service.okhttp.DualHttpClientManager
+import com.vitorpamplona.amethyst.service.okhttp.DualHttpClientManagerForRelays
 import com.vitorpamplona.amethyst.ui.tor.TorManager
 import com.vitorpamplona.amethyst.ui.tor.TorServiceStatus
 import com.vitorpamplona.quartz.nip01Core.relay.client.INostrClient
@@ -45,7 +45,7 @@ import okhttp3.OkHttpClient
 
 class RelayProxyClientConnector(
     val torEvaluator: StateFlow<TorRelayEvaluation>,
-    val okHttpClients: DualHttpClientManager,
+    val okHttpClients: DualHttpClientManagerForRelays,
     val connManager: ConnectivityManager,
     val torManager: TorManager,
     val client: INostrClient,

amethyst/src/main/java/com/vitorpamplona/amethyst/service/uploads/blossom/bud10/BlossomServerResolver.kt

@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.uploads.blossom.bud10
+
+import androidx.collection.LruCache
+import com.vitorpamplona.amethyst.commons.richtext.mimeTypeMap
+import com.vitorpamplona.amethyst.model.privacyOptions.IRoleBasedHttpClientBuilder
+import com.vitorpamplona.quartz.nip01Core.core.Address
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.isValid
+import com.vitorpamplona.quartz.nipB7Blossom.BlossomServersEvent
+import com.vitorpamplona.quartz.nipB7Blossom.BlossomUri
+import com.vitorpamplona.quartz.utils.firstNotNullOrNullAsync
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.merge
+import kotlinx.coroutines.flow.transformLatest
+import kotlinx.coroutines.withTimeoutOrNull
+import okhttp3.OkHttpClient
+import kotlin.collections.toTypedArray
+import kotlin.let
+
+class BlossomServerResolver(
+    val loggedInUsers: () -> List<HexKey>,
+    val blossomServers: (Set<Address>) -> List<Flow<BlossomServersEvent>>,
+    val httpClientBuilder: IRoleBasedHttpClientBuilder,
+) {
+    val blossomHitCache: ServerHeadCache = ServerHeadCache()
+    val uriToUrlCache = LruCache<String, BlossomUriServer>(200)
+
+    class BlossomUriServer(
+        val uri: BlossomUri,
+        val serverUrl: String,
+    )
+
+    fun cachedFindServer(uriStr: String): BlossomUriServer? = uriToUrlCache[uriStr]
+
+    suspend fun findServers(uriStr: String): BlossomUriServer? {
+        uriToUrlCache[uriStr]?.let { return it }
+
+        val result =
+            withTimeoutOrNull(10000) {
+                findServersInner(uriStr)
+            }
+
+        if (result != null) {
+            uriToUrlCache.put(uriStr, result)
+        }
+
+        return result
+    }
+
+    @OptIn(ExperimentalCoroutinesApi::class)
+    suspend fun findServersInner(uriStr: String): BlossomUriServer? {
+        val uri = BlossomUri.parse(uriStr) ?: return null
+
+        val expectedMimeType = mimeTypeMap[uri.extension]
+        val filename = uri.filename()
+
+        if (uri.servers.isNotEmpty()) {
+            val workingUrl = firstWorkingUrl(uri.servers, filename, expectedMimeType, uri.size)
+            if (workingUrl != null) {
+                return BlossomUriServer(uri, workingUrl)
+            }
+        }
+
+        val blossomServerConfigNeeded = mutableSetOf<Address>()
+
+        uri.authors.forEach {
+            if (it.isValid()) {
+                blossomServerConfigNeeded.add(BlossomServersEvent.createAddress(it))
+            }
+        }
+
+        loggedInUsers().forEach {
+            blossomServerConfigNeeded.add(BlossomServersEvent.createAddress(it))
+        }
+
+        val flows =
+            blossomServers(blossomServerConfigNeeded)
+                .map { blossomServerFlow ->
+                    blossomServerFlow.transformLatest {
+                        val servers = it.servers()
+                        if (servers.isNotEmpty()) {
+                            firstWorkingUrl(servers, filename, expectedMimeType, uri.size)?.let { serverUrl ->
+                                emit(serverUrl)
+                            }
+                        }
+                    }
+                }.toTypedArray()
+
+        if (flows.isNotEmpty()) {
+            val serverResult = merge(*flows).first()
+            return BlossomUriServer(uri, serverResult)
+        }
+
+        return null
+    }
+
+    private suspend fun firstWorkingUrl(
+        servers: List<String>,
+        filename: String,
+        expectedMimeType: String?,
+        expectedSize: Long?,
+    ): String? =
+        firstNotNullOrNullAsync(servers, 10000) {
+            blossomHitCache.urlIfServerHasFile(it, filename, expectedMimeType, expectedSize) { url ->
+                client(url, expectedMimeType)
+            }
+        }
+
+    fun client(
+        url: String,
+        mimeType: String?,
+    ): OkHttpClient =
+        if (mimeType == null) {
+            httpClientBuilder.okHttpClientForPreview(url)
+        } else if (mimeType.startsWith("audio/") || mimeType.startsWith("video/")) {
+            httpClientBuilder.okHttpClientForVideo(url)
+        } else if (mimeType.startsWith("image/")) {
+            httpClientBuilder.okHttpClientForImage(url)
+        } else {
+            httpClientBuilder.okHttpClientForPreview(url)
+        }
+
+    fun canResolve(scheme: String) = scheme == SCHEME
+
+    companion object {
+        const val SCHEME = "blossom"
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/service/uploads/blossom/bud10/OpenBlossomUriAsIntent.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.uploads.blossom.bud10
+
+import android.content.Context
+import android.content.Intent
+import androidx.core.net.toUri
+import com.vitorpamplona.amethyst.R
+import kotlin.coroutines.cancellation.CancellationException
+
+fun openBlossomUriAsIntent(
+    context: Context,
+    blossomUri: String,
+    onError: (Int, Int) -> Unit,
+) {
+    try {
+        val intent = Intent(Intent.ACTION_VIEW, blossomUri.toUri())
+        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+
+        context.startActivity(intent)
+    } catch (e: Exception) {
+        if (e is CancellationException) throw e
+        onError(R.string.no_blossom_apps_found_title, R.string.no_blossom_apps_found_description)
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/service/uploads/blossom/bud10/ServerHeadCache.kt

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.uploads.blossom.bud10
+
+import androidx.collection.LruCache
+import kotlinx.coroutines.CancellationException
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.coroutines.executeAsync
+
+class ServerHeadCache {
+    val cache = LruCache<String, HasFile>(200)
+
+    sealed interface HasFile {
+        object NoFile : HasFile
+
+        class TypeAndSize(
+            val mimeType: String,
+            val size: Long,
+        ) : HasFile
+    }
+
+    suspend fun getFileSizeBytes(
+        url: String,
+        client: (url: String) -> OkHttpClient,
+    ): HasFile {
+        cache[url]?.let { return it }
+
+        try {
+            // Build a HEAD request instead of GET
+            val request =
+                Request
+                    .Builder()
+                    .url(url)
+                    .head() // Specifies the HEAD method
+                    .build()
+
+            client(url).newCall(request).executeAsync().use { response ->
+                if (!response.isSuccessful) {
+                    cache.put(url, HasFile.NoFile)
+                    return HasFile.NoFile
+                }
+
+                // Retrieve the "Content-Length" header
+                val contentLength = response.header("Content-Length")?.toLongOrNull()
+                val mimeType = response.header("Content-Type")?.toMediaType()?.toString()
+
+                if (contentLength != null && mimeType != null) {
+                    val result = HasFile.TypeAndSize(mimeType, contentLength)
+                    cache.put(url, result)
+                    return result
+                } else {
+                    cache.put(url, HasFile.NoFile)
+                    return HasFile.NoFile
+                }
+            }
+        } catch (e: Exception) {
+            if (e is CancellationException) throw e
+            cache.put(url, HasFile.NoFile)
+            return HasFile.NoFile
+        }
+    }
+
+    suspend fun urlIfServerHasFile(
+        server: String,
+        filename: String,
+        expectedMimeType: String?,
+        expectedSize: Long?,
+        client: (url: String) -> OkHttpClient,
+    ): String? {
+        val url =
+            if (server.startsWith("http")) {
+                server.removeSuffix("/") + "/" + filename
+            } else {
+                "https://" + server.removeSuffix("/") + "/" + filename
+            }
+
+        val result = getFileSizeBytes(url, client)
+
+        if (result is HasFile.TypeAndSize) {
+            if (expectedSize == null && expectedMimeType == null) {
+                // any match goes
+                return url
+            } else {
+                if (result.size == expectedSize) {
+                    return url
+                }
+                if (expectedSize == null && result.size > 0 && result.mimeType == expectedMimeType) {
+                    return url
+                }
+            }
+        }
+        return null
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ClickableUrl.kt

@@ -21,24 +21,32 @@
 package com.vitorpamplona.amethyst.ui.components
 
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalUriHandler
 import androidx.compose.ui.text.style.TextOverflow
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.openBlossomUriAsIntent
 
 @Composable
 fun ClickableUrl(
     urlText: String,
     url: String,
+    onError: (Int, Int) -> Unit = { _, _ -> },
 ) {
     val uri = LocalUriHandler.current
+    val context = LocalContext.current
 
     ClickableTextPrimary(
         text = urlText,
         maxLines = 1,
-        overflow = TextOverflow.Ellipsis,
+        overflow = TextOverflow.MiddleEllipsis,
         onClick = {
-            runCatching {
-                val doubleCheckedUrl = if (url.contains("://")) url else "https://$url"
-                uri.openUri(doubleCheckedUrl)
+            if (url.startsWith("blossom:")) {
+                openBlossomUriAsIntent(context, url, onError)
+            } else {
+                runCatching {
+                    val doubleCheckedUrl = if (url.contains("://")) url else "https://$url"
+                    uri.openUri(doubleCheckedUrl)
+                }
             }
         },
     )

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ImageGallery.kt

@@ -144,7 +144,7 @@ fun ImageGallery(
         images.words
             .mapNotNull { segment ->
                 val imageUrl = segment.segmentText
-                state.imagesForPager[imageUrl] as? MediaUrlImage
+                state.mediaForPager[imageUrl] as? MediaUrlImage
             }.toImmutableList()
 
     Column(modifier = modifier.padding(vertical = Size10dp)) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/LoadUrlPreview.kt

@@ -76,7 +76,7 @@ fun LoadUrlPreviewDirect(
 
             is UrlPreviewState.Loading -> {
                 WaitAndDisplay {
-                    DisplayUrlWithLoadingSymbol(url)
+                    DisplayUrlWithLoadingSymbol(url, accountViewModel.toastManager::toast)
                 }
             }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/MyAsyncImage.kt

@@ -82,7 +82,7 @@ fun MyAsyncImage(
                                         LoadingAnimation(Size40dp, Size6dp)
                                     }
                                 } else {
-                                    DisplayUrlWithLoadingSymbol(imageUrl)
+                                    DisplayUrlWithLoadingSymbol(imageUrl, accountViewModel.toastManager::toast)
                                 }
                             }
                         }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/RichTextViewer.kt

@@ -47,6 +47,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalFontFamilyResolver
 import androidx.compose.ui.platform.LocalLayoutDirection
@@ -54,18 +55,21 @@ import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.TextMeasurer
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.text.withStyle
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.LayoutDirection
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.em
+import com.vitorpamplona.amethyst.Amethyst
 import com.vitorpamplona.amethyst.commons.compose.produceCachedState
 import com.vitorpamplona.amethyst.commons.emojicoder.EmojiCoder
 import com.vitorpamplona.amethyst.commons.model.EmptyTagList
 import com.vitorpamplona.amethyst.commons.model.ImmutableListOfLists
 import com.vitorpamplona.amethyst.commons.richtext.Base64Segment
 import com.vitorpamplona.amethyst.commons.richtext.BechSegment
+import com.vitorpamplona.amethyst.commons.richtext.BlossomUriSegment
 import com.vitorpamplona.amethyst.commons.richtext.CashuSegment
 import com.vitorpamplona.amethyst.commons.richtext.EmailSegment
 import com.vitorpamplona.amethyst.commons.richtext.EmojiSegment
@@ -93,6 +97,7 @@ import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.model.checkForHashtagWithIcon
 import com.vitorpamplona.amethyst.service.CachedRichTextParser
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.user.observeUserInfo
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.openBlossomUriAsIntent
 import com.vitorpamplona.amethyst.ui.actions.CrossfadeIfEnabled
 import com.vitorpamplona.amethyst.ui.components.markdown.RenderContentAsMarkdown
 import com.vitorpamplona.amethyst.ui.navigation.navs.EmptyNav
@@ -112,6 +117,7 @@ import com.vitorpamplona.amethyst.ui.theme.ThemeComparisonColumn
 import com.vitorpamplona.amethyst.ui.theme.inlinePlaceholder
 import com.vitorpamplona.amethyst.ui.theme.innerPostModifier
 import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
+import com.vitorpamplona.quartz.nipB7Blossom.BlossomUri
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
@@ -170,6 +176,10 @@ fun RenderStrangeNamePreview() {
                         ClickableRelayUrl(word.segmentText, EmptyNav())
                     }
 
+                    is BlossomUriSegment -> {
+                        ClickableRelayUrl(word.segmentText, EmptyNav())
+                    }
+
                     is SchemelessUrlSegment -> {
                         NoProtocolUrlRenderer(word.segmentText)
                     }
@@ -500,6 +510,8 @@ private fun RenderWordWithoutPreview(
 
         is RelayUrlSegment -> ClickableRelayUrl(word.segmentText, nav)
 
+        is BlossomUriSegment -> BlossomUriRendererNoPreview(word.segmentText, accountViewModel)
+
         is SchemelessUrlSegment -> NoProtocolUrlRenderer(word.segmentText)
     }
 }
@@ -532,19 +544,91 @@ private fun RenderWordWithPreview(
         is RegularTextSegment -> Text(word.segmentText)
         is Base64Segment -> ZoomableContentView(word.segmentText, state, accountViewModel)
         is RelayUrlSegment -> ClickableRelayUrl(word.segmentText, nav)
+        is BlossomUriSegment -> BlossomUriRenderer(word.segmentText, state, callbackUri, accountViewModel)
         is SchemelessUrlSegment -> NoProtocolUrlRenderer(word.segmentText)
     }
 }
 
+@Composable
+fun BlossomUriRenderer(
+    word: String,
+    state: RichTextViewerState,
+    callbackUri: String? = null,
+    accountViewModel: AccountViewModel,
+) {
+    val isMedia = state.mediaForPager.contains(word)
+
+    if (isMedia) {
+        ZoomableContentView(word, state, accountViewModel)
+    } else {
+        val serverResultState =
+            remember(word) {
+                mutableStateOf(Amethyst.instance.blossomResolver.cachedFindServer(word))
+            }
+
+        if (serverResultState.value == null) {
+            LaunchedEffect(word) {
+                serverResultState.value = Amethyst.instance.blossomResolver.findServers(word)
+            }
+        }
+
+        val serverResult = serverResultState.value
+        if (serverResult != null && serverResult.serverUrl.isNotBlank()) {
+            LoadUrlPreview(serverResult.serverUrl, serverResult.uri.filename(), callbackUri, accountViewModel)
+        } else {
+            ClickableBlossomUri(word, accountViewModel)
+        }
+    }
+}
+
+@Composable
+fun ClickableBlossomUri(
+    blossomUri: String,
+    accountViewModel: AccountViewModel,
+) {
+    val context = LocalContext.current
+
+    ClickableTextPrimary(
+        text = remember { BlossomUri.parse(blossomUri)?.filename() ?: blossomUri },
+        maxLines = 1,
+        overflow = TextOverflow.MiddleEllipsis,
+        onClick = { openBlossomUriAsIntent(context, blossomUri, accountViewModel.toastManager::toast) },
+    )
+}
+
+@Composable
+fun BlossomUriRendererNoPreview(
+    word: String,
+    accountViewModel: AccountViewModel,
+) {
+    val serverResultState =
+        remember(word) {
+            mutableStateOf(Amethyst.instance.blossomResolver.cachedFindServer(word))
+        }
+
+    if (serverResultState.value == null) {
+        LaunchedEffect(word) {
+            serverResultState.value = Amethyst.instance.blossomResolver.findServers(word)
+        }
+    }
+
+    val serverResult = serverResultState.value
+    if (serverResult != null && serverResult.serverUrl.isNotBlank()) {
+        ClickableUrl(serverResult.uri.filename(), serverResult.serverUrl)
+    } else {
+        ClickableBlossomUri(word, accountViewModel)
+    }
+}
+
 @Composable
 private fun ZoomableContentView(
     word: String,
     state: RichTextViewerState,
     accountViewModel: AccountViewModel,
 ) {
-    state.imagesForPager[word]?.let {
+    state.mediaForPager[word]?.let {
         Box(modifier = HalfVertPadding) {
-            ZoomableContentView(it, state.imageList, roundedCorner = true, contentScale = ContentScale.FillWidth, accountViewModel)
+            ZoomableContentView(it, state.mediaList, roundedCorner = true, contentScale = ContentScale.FillWidth, accountViewModel)
         }
     }
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ZoomableContentView.kt

@@ -86,6 +86,7 @@ import com.vitorpamplona.amethyst.commons.richtext.MediaUrlVideo
 import com.vitorpamplona.amethyst.model.MediaAspectRatioCache
 import com.vitorpamplona.amethyst.service.images.BlurhashWrapper
 import com.vitorpamplona.amethyst.service.playback.composable.VideoView
+import com.vitorpamplona.amethyst.service.uploads.blossom.bud10.openBlossomUriAsIntent
 import com.vitorpamplona.amethyst.ui.actions.CrossfadeIfEnabled
 import com.vitorpamplona.amethyst.ui.actions.InformationDialog
 import com.vitorpamplona.amethyst.ui.note.BlankNote
@@ -286,7 +287,7 @@ fun LocalImageView(
                                     }
                                 } else {
                                     WaitAndDisplay {
-                                        DisplayUrlWithLoadingSymbol(content)
+                                        DisplayUrlWithLoadingSymbol(content, accountViewModel.toastManager::toast)
                                     }
                                 }
                             }
@@ -408,7 +409,7 @@ fun UrlImageView(
                                 }
                             } else {
                                 WaitAndDisplay {
-                                    DisplayUrlWithLoadingSymbol(content)
+                                    DisplayUrlWithLoadingSymbol(content, accountViewModel.toastManager::toast)
                                 }
                             }
                         }
@@ -580,7 +581,10 @@ fun WaitAndDisplay(content: @Composable (AnimatedVisibilityScope.() -> Unit)) {
 }
 
 @Composable
-fun DisplayUrlWithLoadingSymbol(content: BaseMediaContent) {
+fun DisplayUrlWithLoadingSymbol(
+    content: BaseMediaContent,
+    onError: (Int, Int) -> Unit = { _, _ -> },
+) {
     val uri = LocalUriHandler.current
 
     val primary = MaterialTheme.colorScheme.primary
@@ -589,6 +593,8 @@ fun DisplayUrlWithLoadingSymbol(content: BaseMediaContent) {
     val regularText = remember { SpanStyle(color = background) }
     val clickableTextStyle = remember { SpanStyle(color = primary) }
 
+    val context = LocalContext.current
+
     val annotatedTermsString =
         remember {
             buildAnnotatedString {
@@ -614,7 +620,13 @@ fun DisplayUrlWithLoadingSymbol(content: BaseMediaContent) {
     val pressIndicator =
         remember {
             if (content is MediaUrlContent) {
-                Modifier.clickable { runCatching { uri.openUri(content.url) } }
+                Modifier.clickable {
+                    if (content.url.startsWith("blossom:")) {
+                        openBlossomUriAsIntent(context, content.url, onError)
+                    } else {
+                        runCatching { uri.openUri(content.url) }
+                    }
+                }
             } else {
                 Modifier
             }
@@ -628,10 +640,8 @@ fun DisplayUrlWithLoadingSymbol(content: BaseMediaContent) {
     ) {
         Text(
             text = annotatedTermsString,
-            modifier =
-                pressIndicator
-                    .weight(1f, fill = false),
-            overflow = TextOverflow.Ellipsis,
+            modifier = pressIndicator.weight(1f, fill = false),
+            overflow = TextOverflow.MiddleEllipsis,
             maxLines = 1,
         )
         InlineLoadingIcon()
@@ -639,7 +649,10 @@ fun DisplayUrlWithLoadingSymbol(content: BaseMediaContent) {
 }
 
 @Composable
-fun DisplayUrlWithLoadingSymbol(url: String) {
+fun DisplayUrlWithLoadingSymbol(
+    url: String,
+    onError: (Int, Int) -> Unit = { _, _ -> },
+) {
     val uri = LocalUriHandler.current
 
     val primary = MaterialTheme.colorScheme.primary
@@ -654,7 +667,20 @@ fun DisplayUrlWithLoadingSymbol(url: String) {
             }
         }
 
-    val pressIndicator = remember { Modifier.clickable { runCatching { uri.openUri(url) } } }
+    val context = LocalContext.current
+
+    val pressIndicator =
+        remember {
+            Modifier.clickable {
+                if (url.startsWith("blossom:")) {
+                    openBlossomUriAsIntent(context, url, onError)
+                } else {
+                    runCatching {
+                        uri.openUri(url)
+                    }
+                }
+            }
+        }
 
     Row(
         modifier = Modifier.width(IntrinsicSize.Max),

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/creators/previews/PreviewUrl.kt

@@ -292,7 +292,7 @@ private fun MyLoadUrlPreviewDirectFillWidth(
 
             is UrlPreviewState.Loading -> {
                 WaitAndDisplay {
-                    DisplayUrlWithLoadingSymbol(url)
+                    DisplayUrlWithLoadingSymbol(url, accountViewModel.toastManager::toast)
                 }
             }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/AccountSessionManager.kt

@@ -101,6 +101,8 @@ class AccountSessionManager(
     private val _accountContent = MutableStateFlow<AccountState>(AccountState.Loading)
     val accountContent = _accountContent.asStateFlow()
 
+    fun loggedInAccount() = (_accountContent.value as? AccountState.LoggedIn)?.account
+
     fun loginWithDefaultAccountIfLoggedOff() {
         // pulls account from storage.
         if (_accountContent.value !is AccountState.LoggedIn) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/privateDM/send/upload/SuccessfulUploads.kt

@@ -20,9 +20,11 @@
  */
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.privateDM.send.upload
 
+import androidx.compose.runtime.Stable
 import com.vitorpamplona.amethyst.service.uploads.UploadOrchestrator
 import com.vitorpamplona.quartz.utils.ciphers.AESGCM
 
+@Stable
 class SuccessfulUploads(
     val result: UploadOrchestrator.OrchestratorResult.ServerResult,
     val caption: String?,

amethyst/src/main/res/values/strings.xml

@@ -1081,6 +1081,9 @@
     <string name="no_wallet_found_with_error">No Wallets found to pay a lightning invoice (Error: %1$s). Please install a Lightning wallet to use zaps</string>
     <string name="no_wallet_found">No Wallets found to pay a lightning invoice. Please install a Lightning wallet to use zaps</string>
 
+    <string name="no_blossom_apps_found_title">Can\'t open Blossom links</string>
+    <string name="no_blossom_apps_found_description">Blossom apps were not found. Please install a local Blossom app to see this file</string>
+
     <string name="hidden_words">Hidden Words</string>
     <string name="hide_new_word_label">Hide new word or sentence</string>
     <string name="automatically_show_profile_picture">Profile Picture</string>