fix: update check via GitHub web endpoint, avoiding API 60 req/hour rate limit

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/UpdateRepository.kt

@@ -5,7 +5,6 @@ import com.rtbishop.look4sat.core.domain.repository.IUpdateRepository
 import com.rtbishop.look4sat.core.domain.source.IRemoteSource
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import org.json.JSONObject
 import java.io.File
 
 class UpdateRepository(
@@ -13,11 +12,15 @@ class UpdateRepository(
 ) : IUpdateRepository {
 
     override suspend fun getLatestRelease(): LatestRelease? = withContext(Dispatchers.IO) {
+        // Use the GitHub releases web page instead of the REST API endpoint:
+        // the API endpoint is rate-limited to 60 requests/hour per IP, which is
+        // quickly exhausted on shared egress IPs (e.g. VPN proxies), causing 403
+        // failures. The web endpoint redirects to the latest tag with no such limit.
         val result = remoteSource.getNetworkStream(LATEST_RELEASE_URL)
         val stream = result.stream ?: return@withContext null
         try {
-            val json = stream.bufferedReader().use { it.readText() }
-            parseRelease(json)
+            val html = stream.bufferedReader().use { it.readText() }
+            parseRelease(html)
         } catch (e: Exception) {
             println("UpdateRepository parse failure: $e")
             null
@@ -37,31 +40,33 @@ class UpdateRepository(
         }
     }
 
-    private fun parseRelease(json: String): LatestRelease? {
-        val obj = JSONObject(json)
-        val tag = obj.optString("tag_name")
-        if (tag.isBlank()) return null
-        val assets = obj.optJSONArray("assets")
-        var apkUrl: String? = null
-        if (assets != null) {
-            for (i in 0 until assets.length()) {
-                val asset = assets.optJSONObject(i) ?: continue
-                val name = asset.optString("name", "")
-                if (name.endsWith(".apk")) {
-                    apkUrl = asset.optString("browser_download_url", "").ifBlank { null }
-                    if (apkUrl != null) break
-                }
-            }
-        }
+    private fun parseRelease(html: String): LatestRelease? {
+        // The redirect target is the latest release's tag page. Extract the tag
+        // from the og:url meta tag ("…/releases/tag/v4.4.6-ba7opf.8") — stable and
+        // unambiguous. The <title> also holds the release name, but that is free
+        // text and cannot be used to build the asset URL.
+        val ogUrl = Regex("<meta\\s+property=\"og:url\"\\s+content=\"([^\"]*)\"").find(html)
+            ?.groupValues?.get(1) ?: return null
+        val tag = Regex("/releases/tag/(v[0-9][0-9A-Za-z.\\-]*)$").find(ogUrl)
+            ?.groupValues?.get(1) ?: return null
+        val title = Regex("<title>(.*?)</title>", RegexOption.DOT_MATCHES_ALL)
+            .find(html)?.groupValues?.get(1)?.trim()
+            ?.substringBefore("·")?.removePrefix("Release")?.trim() ?: tag
+        // The release APK asset follows the fixed naming scheme used by the build:
+        // Look4Sat-<tag without leading v>-release.apk
+        val apkUrl = "$DOWNLOAD_BASE_URL/$tag/Look4Sat-${tag.removePrefix("v")}-release.apk"
         return LatestRelease(
             versionTag = tag,
-            title = obj.optString("name", ""),
-            body = obj.optString("body", ""),
+            title = title,
+            body = "",
             apkUrl = apkUrl
         )
     }
 
     private companion object {
-        const val LATEST_RELEASE_URL = "https://api.github.com/repos/atsunatsu/Look4Sat/releases/latest"
+        // Web pages are used instead of api.github.com to avoid the 60 req/hour
+        // anonymous rate limit (see getLatestRelease above).
+        const val LATEST_RELEASE_URL = "https://github.com/atsunatsu/Look4Sat/releases/latest"
+        const val DOWNLOAD_BASE_URL = "https://github.com/atsunatsu/Look4Sat/releases/download"
     }
 }