Fix empty usage-history chart + externalize signing secrets

History chart: recordHistory() threw away the previous point whenever a
new reading landed within the 2-min de-dup window, but the foreground loop
refreshes every 30s — so history could never grow past one point while the
app was open and the chart stayed stuck on 'Collecting history…'. Now it
throttles by SKIPPING a too-soon reading instead of replacing the last one,
so points accumulate during normal use.

Security:
- Remove hardcoded release keystore passwords from build.gradle.kts; read
  from env vars / gitignored keystore.properties; CI injects from Gitea
  secrets (KEYSTORE_PASSWORD/KEY_PASSWORD). Signing identity unchanged.
- Make the cookie-never-plaintext invariant explicit on the read path.
- Drop custom ACTION_REFRESH from the exported widget intent-filter so other
  apps can't trigger refreshes; internal explicit PendingIntent still works.
- Gate an unguarded Log.w behind BuildConfig.DEBUG.

.gitea/workflows/build.yml

@@ -56,6 +56,20 @@ jobs:
           fi
           echo "${{ secrets.KEYSTORE_BASE64 }}" | base64 -d > app/claude-widget-release.keystore
 
+      # Signing passwords are no longer hardcoded in build.gradle.kts — inject them at build time.
+      - name: Write signing credentials
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          if [ -z "${{ secrets.KEYSTORE_PASSWORD }}" ] || [ -z "${{ secrets.KEY_PASSWORD }}" ]; then
+            echo "::error::KEYSTORE_PASSWORD / KEY_PASSWORD secrets not set — cannot sign release."
+            exit 1
+          fi
+          {
+            echo "storePassword=${{ secrets.KEYSTORE_PASSWORD }}"
+            echo "keyPassword=${{ secrets.KEY_PASSWORD }}"
+            echo "keyAlias=${{ secrets.KEY_ALIAS || 'claudewidget' }}"
+          } > keystore.properties
+
       - name: Build release APK
         if: startsWith(github.ref, 'refs/tags/')
         run: ./gradlew :app:assembleRelease --no-daemon

.gitignore

@@ -10,3 +10,4 @@ captures/
 .cxx/
 *.keystore
 *.jks
+keystore.properties

app/build.gradle.kts

@@ -1,8 +1,21 @@
+import java.util.Properties
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
 }
 
+// Signing credentials are NEVER committed. They are read from (in order):
+//   1. environment variables  (KEYSTORE_PASSWORD / KEY_PASSWORD / KEY_ALIAS)  — used by CI
+//   2. keystore.properties at the repo root (gitignored)                      — used locally
+// See keystore.properties.example. Debug builds need none of this.
+val keystoreProps = Properties().apply {
+    val f = rootProject.file("keystore.properties")
+    if (f.exists()) f.inputStream().use { load(it) }
+}
+fun signingCred(envName: String, propName: String): String? =
+    System.getenv(envName) ?: keystoreProps.getProperty(propName)
+
 android {
     namespace = "me.khodak.claudeusage"
     compileSdk = 34
@@ -15,12 +28,22 @@ android {
         versionName = "1.18"
     }
 
+    val releaseStorePassword = signingCred("KEYSTORE_PASSWORD", "storePassword")
+    val releaseKeyPassword = signingCred("KEY_PASSWORD", "keyPassword")
+    val releaseKeyAlias = signingCred("KEY_ALIAS", "keyAlias") ?: "claudewidget"
+    val hasSigningCreds = releaseStorePassword != null && releaseKeyPassword != null
+
     signingConfigs {
         create("release") {
+            // Only wire the keystore when credentials are present, so debug builds and
+            // credential-less checkouts configure cleanly. Same keystore file + alias as before —
+            // signing identity is unchanged; only the password source moved out of version control.
+            if (hasSigningCreds) {
                 storeFile = file("claude-widget-release.keystore")
-            storePassword = "ClaudeWidget2026!"
-            keyAlias = "claudewidget"
-            keyPassword = "ClaudeWidget2026!"
+                storePassword = releaseStorePassword
+                keyAlias = releaseKeyAlias
+                keyPassword = releaseKeyPassword
+            }
         }
     }
 
@@ -29,7 +52,13 @@ android {
             isMinifyEnabled = true
             isShrinkResources = true
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            // Sign only when creds were supplied; otherwise fail loudly at assembleRelease rather
+            // than silently shipping an unsigned APK. Tag builds in CI inject creds (see workflow).
+            if (hasSigningCreds) {
                 signingConfig = signingConfigs.getByName("release")
+            } else {
+                logger.warn("No signing credentials (KEYSTORE_PASSWORD/keystore.properties) — release APK will be unsigned.")
+            }
         }
     }
 

app/src/main/AndroidManifest.xml

@@ -32,9 +32,11 @@
         <receiver
             android:name=".ClaudeUsageWidget"
             android:exported="true">
+            <!-- Only the system APPWIDGET_UPDATE action is exposed. ACTION_REFRESH is delivered via
+                 the widget's own explicit PendingIntent (explicit broadcasts need no intent-filter),
+                 so other apps can no longer trigger refreshes by sending that action externally. -->
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-                <action android:name="me.khodak.claudeusage.ACTION_REFRESH" />
             </intent-filter>
             <meta-data
                 android:name="android.appwidget.provider"

app/src/main/java/me/khodak/claudeusage/UsageRepository.kt

@@ -87,7 +87,7 @@ class UsageRepository(private val prefs: PreferencesManager) {
                 )
             }
         } catch (e: Exception) {
-            Log.w(TAG, "/usage failed: ${e.message}")
+            if (BuildConfig.DEBUG) Log.w(TAG, "/usage failed: ${e.message}")
         }
 
         // Step 3: fallback endpoints (message-count style)

app/src/main/java/me/khodak/claudeusage/data/PreferencesManager.kt

@@ -24,9 +24,14 @@ class PreferencesManager(context: Context) {
         } catch (_: Exception) {}
     }
 
-    fun getCookies(): String? = try {
+    fun getCookies(): String? {
+        // Cookies are never written in fallback (plaintext) mode — make that invariant explicit on
+        // the read side too, so any future write that bypasses the guard still can't surface here.
+        if (usingFallbackPrefs) return null
+        return try {
             securePrefs.getString(KEY_COOKIES, null)
         } catch (_: Exception) { null }
+    }
 
     fun clearSession() {
         try { securePrefs.edit().clear().apply() } catch (_: Exception) {}
@@ -98,9 +103,11 @@ class PreferencesManager(context: Context) {
         if (data.fiveHourUtilization < 0f && data.weeklyUtilization < 0f) return
         val now = System.currentTimeMillis()
         val history = getHistory().toMutableList()
-        if (history.isNotEmpty() && now - history.last().epochMs < MIN_HISTORY_GAP_MS) {
-            history.removeAt(history.size - 1) // collapse near-simultaneous readings
-        }
+        // Throttle to at most one point per MIN_HISTORY_GAP_MS by SKIPPING a too-soon reading.
+        // (Previously we deleted the last point and re-added in place — but the foreground loop
+        // refreshes every 30s, well inside this 2-min window, so history could never grow past a
+        // single point while the app was open and the chart stayed on "Collecting history…".)
+        if (history.isNotEmpty() && now - history.last().epochMs < MIN_HISTORY_GAP_MS) return
         history.add(
             UsageSnapshot(
                 epochMs = now,

keystore.properties.example

@@ -0,0 +1,12 @@
+# Release signing credentials for local builds.
+# Copy to `keystore.properties` (which is gitignored) and fill in the real values.
+# These are NEVER committed. CI injects the same values from Gitea Actions secrets.
+#
+#   cp keystore.properties.example keystore.properties
+#
+# The keystore file itself (app/claude-widget-release.keystore) is also gitignored.
+# Signing identity is unchanged from older builds — same keystore, same alias.
+
+storePassword=CHANGE_ME
+keyPassword=CHANGE_ME
+keyAlias=claudewidget