From 6c14531da301e08e8f8b38d047347ff4e34c6b78 Mon Sep 17 00:00:00 2001
From: SimpleTest <simpletestxxx@gmail.com>
Date: Mon, 27 Jul 2026 02:35:27 +0300
Subject: [PATCH] Prepare pre-Play production application release

---
 android/Dockerfile                      |  6 ++-
 docs/operations.md                      | 18 ++++++-
 scripts/android-development-build.sh    | 17 +++++++
 scripts/android-release-build.sh        | 17 +++++++
 scripts/android-staging-build.sh        | 17 +++++++
 scripts/check-environment-readiness.sh  | 16 ++++--
 scripts/production-release-remote.sh    | 11 ++--
 scripts/production-release.sh           |  2 +-
 scripts/production-rollback-remote.sh   |  3 +-
 scripts/quality.sh                      | 16 ++++++
 scripts/set-deployment-revision.sh      | 18 ++++++-
 scripts/validate-android-environment.sh | 26 +++++++++-
 scripts/validate-production-env.sh      | 67 +++++++++++++++----------
 13 files changed, 191 insertions(+), 43 deletions(-)

diff --git a/android/Dockerfile b/android/Dockerfile
index 7e8790f..c08ea38 100644
--- a/android/Dockerfile
+++ b/android/Dockerfile
@@ -165,6 +165,7 @@ ARG WNH_FIREBASE_PROJECT_ID
 ARG WNH_FIREBASE_GCM_SENDER_ID
 ARG WNH_PUBLIC_BUILD_TYPE
 ARG WNH_EXPECTED_APPLICATION_ID
+ARG WNH_SIGNING_CERT_SHA256
 
 RUN --mount=type=cache,target=/home/gradle/.gradle,uid=1000,gid=1000 \
     --mount=type=cache,target=/home/gradle/.android,uid=1000,gid=1000 \
@@ -177,6 +178,7 @@ RUN --mount=type=cache,target=/home/gradle/.gradle,uid=1000,gid=1000 \
       *) echo "WNH_PUBLIC_BUILD_TYPE must be development or staging" >&2; exit 1 ;; \
     esac \
     && test -n "${WNH_EXPECTED_APPLICATION_ID}" \
+    && test -n "${WNH_SIGNING_CERT_SHA256}" \
     && WNH_ANDROID_SIGNING_STORE_FILE=/run/secrets/android_nonproduction_keystore \
     WNH_ANDROID_SIGNING_PASSWORD_FILE=/run/secrets/android_nonproduction_password \
     gradle --no-daemon \
@@ -256,13 +258,15 @@ ARG WNH_FIREBASE_APPLICATION_ID
 ARG WNH_FIREBASE_CLIENT_VALUE
 ARG WNH_FIREBASE_PROJECT_ID
 ARG WNH_FIREBASE_GCM_SENDER_ID
+ARG WNH_SIGNING_CERT_SHA256
 
 RUN --mount=type=cache,target=/home/gradle/.gradle,uid=1000,gid=1000 \
     --mount=type=cache,target=/home/gradle/.android,uid=1000,gid=1000 \
     --mount=type=secret,id=android_upload_keystore,required=true,uid=1000,gid=1000,mode=0400 \
     --mount=type=secret,id=android_upload_password,required=true,uid=1000,gid=1000,mode=0400 \
     --mount=type=secret,id=android_upload_alias,required=true,env=WNH_ANDROID_SIGNING_KEY_ALIAS \
-    WNH_ANDROID_SIGNING_STORE_FILE=/run/secrets/android_upload_keystore \
+    test -n "${WNH_SIGNING_CERT_SHA256}" \
+    && WNH_ANDROID_SIGNING_STORE_FILE=/run/secrets/android_upload_keystore \
     WNH_ANDROID_SIGNING_PASSWORD_FILE=/run/secrets/android_upload_password \
     gradle --no-daemon \
         "-PWNH_BASE_URL=${WNH_BASE_URL}" \
diff --git a/docs/operations.md b/docs/operations.md
index e8e58e5..e2f2ecc 100644
--- a/docs/operations.md
+++ b/docs/operations.md
@@ -174,6 +174,16 @@ ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS=PLAY_APP_SIGNING_SHA256
 
 Run `./scripts/android-release-build.sh` from that production release checkout.
 It produces an APK, Play AAB, package report, signing report, and lint report.
+Before the Play application exists, the build may use only the upload
+certificate in `ANDROID_APP_LINKS_SHA256_CERT_FINGERPRINTS` and leave
+`ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS` empty. This is sufficient
+to create the first signed AAB, but `check-environment-readiness.sh
+--require-release` intentionally continues to report the Play identity as
+missing. Application-only server releases use
+`--require-server-release` plus the production validator's
+`--allow-pre-play` mode: they accept this upload-certificate-only state while
+continuing to reject every other missing production capability. These modes do
+not make an Android build ready for Google Play.
 After Play App Signing is enabled, add the Play signing certificate fingerprint
 to the comma-separated App Links value; the upload certificate alone does not
 describe Play-delivered APKs. Record the same Play fingerprint separately in
@@ -942,8 +952,12 @@ verified Git bundle and transferred directly over SSH to only
 The default `plan` action is read-only. It verifies the exact local and remote
 commits, requires a fast-forward history, checks the production checkout,
 Compose scope and healthy containers, checks public readiness, opens a
-read-only PostgreSQL connection, and runs the complete environment capability
-preflight. It neither uploads a bundle nor creates a backup.
+read-only PostgreSQL connection, and runs the server-release environment
+capability preflight. Before the first Google Play release, this preflight
+allows only the absent Play App Signing certificate; the stricter
+`check-environment-readiness.sh .env --require-release` remains the gate for
+publishing Android through Google Play. The plan neither uploads a bundle nor
+creates a backup.
 
 After reviewing the exact commit printed by the plan, execution additionally
 requires an explicit per-commit confirmation:
diff --git a/scripts/android-development-build.sh b/scripts/android-development-build.sh
index d257d70..5b64aa1 100755
--- a/scripts/android-development-build.sh
+++ b/scripts/android-development-build.sh
@@ -39,10 +39,27 @@ for secret_file in "$KEYSTORE" "$PASSWORD_FILE"; do
   esac
 done
 
+SIGNING_CERT_SHA256=$(
+  keytool -list -v \
+    -storetype PKCS12 \
+    -keystore "$KEYSTORE" \
+    -storepass:file "$PASSWORD_FILE" \
+    -alias "$WNH_ANDROID_DEVELOPMENT_SIGNING_KEY_ALIAS" |
+    awk -F': ' '
+      /SHA256:/ {
+        print $2
+        found = 1
+        exit
+      }
+      END { if (!found) exit 1 }
+    '
+)
+
 docker build \
   --secret "id=android_nonproduction_keystore,src=$KEYSTORE" \
   --secret "id=android_nonproduction_password,src=$PASSWORD_FILE" \
   --secret "id=android_nonproduction_alias,env=WNH_ANDROID_DEVELOPMENT_SIGNING_KEY_ALIAS" \
+  --build-arg "WNH_SIGNING_CERT_SHA256=$SIGNING_CERT_SHA256" \
   --build-arg "WNH_BASE_URL=$WNH_BASE_URL" \
   --build-arg "WNH_TRACKING_MIN_TIME_MS=$WNH_TRACKING_MIN_TIME_MS" \
   --build-arg "WNH_TRACKING_HTTP_TIMEOUT_MS=$WNH_TRACKING_HTTP_TIMEOUT_MS" \
diff --git a/scripts/android-release-build.sh b/scripts/android-release-build.sh
index 5ec9dff..e2f0dd6 100755
--- a/scripts/android-release-build.sh
+++ b/scripts/android-release-build.sh
@@ -50,6 +50,22 @@ for secret_file in "$KEYSTORE" "$PASSWORD_FILE"; do
   esac
 done
 
+SIGNING_CERT_SHA256=$(
+  keytool -list -v \
+    -storetype PKCS12 \
+    -keystore "$KEYSTORE" \
+    -storepass:file "$PASSWORD_FILE" \
+    -alias "$WNH_ANDROID_SIGNING_KEY_ALIAS" |
+    awk -F': ' '
+      /SHA256:/ {
+        print $2
+        found = 1
+        exit
+      }
+      END { if (!found) exit 1 }
+    '
+)
+
 case "$OUTPUT_DIR" in
   /*) ;;
   *) OUTPUT_DIR="$ROOT/$OUTPUT_DIR" ;;
@@ -59,6 +75,7 @@ docker build \
   --secret "id=android_upload_keystore,src=$KEYSTORE" \
   --secret "id=android_upload_password,src=$PASSWORD_FILE" \
   --secret "id=android_upload_alias,env=WNH_ANDROID_SIGNING_KEY_ALIAS" \
+  --build-arg "WNH_SIGNING_CERT_SHA256=$SIGNING_CERT_SHA256" \
   --build-arg "WNH_BASE_URL=$WNH_BASE_URL" \
   --build-arg "WNH_TRACKING_MIN_TIME_MS=$WNH_TRACKING_MIN_TIME_MS" \
   --build-arg "WNH_TRACKING_HTTP_TIMEOUT_MS=$WNH_TRACKING_HTTP_TIMEOUT_MS" \
diff --git a/scripts/android-staging-build.sh b/scripts/android-staging-build.sh
index 4001e56..16e1ba0 100755
--- a/scripts/android-staging-build.sh
+++ b/scripts/android-staging-build.sh
@@ -40,10 +40,27 @@ for secret_file in "$KEYSTORE" "$PASSWORD_FILE"; do
   esac
 done
 
+SIGNING_CERT_SHA256=$(
+  keytool -list -v \
+    -storetype PKCS12 \
+    -keystore "$KEYSTORE" \
+    -storepass:file "$PASSWORD_FILE" \
+    -alias "$WNH_ANDROID_STAGING_SIGNING_KEY_ALIAS" |
+    awk -F': ' '
+      /SHA256:/ {
+        print $2
+        found = 1
+        exit
+      }
+      END { if (!found) exit 1 }
+    '
+)
+
 docker build \
   --secret "id=android_nonproduction_keystore,src=$KEYSTORE" \
   --secret "id=android_nonproduction_password,src=$PASSWORD_FILE" \
   --secret "id=android_nonproduction_alias,env=WNH_ANDROID_STAGING_SIGNING_KEY_ALIAS" \
+  --build-arg "WNH_SIGNING_CERT_SHA256=$SIGNING_CERT_SHA256" \
   --build-arg "WNH_BASE_URL=$WNH_BASE_URL" \
   --build-arg "WNH_TRACKING_MIN_TIME_MS=$WNH_TRACKING_MIN_TIME_MS" \
   --build-arg "WNH_TRACKING_HTTP_TIMEOUT_MS=$WNH_TRACKING_HTTP_TIMEOUT_MS" \
diff --git a/scripts/check-environment-readiness.sh b/scripts/check-environment-readiness.sh
index d2d5324..8a8095a 100755
--- a/scripts/check-environment-readiness.sh
+++ b/scripts/check-environment-readiness.sh
@@ -9,8 +9,9 @@ if [[ "$env_file" != /* ]]; then
   env_file="$ROOT/$env_file"
 fi
 
-if [[ "$mode" != "" && "$mode" != "--require-release" ]]; then
-  echo "Usage: $0 [ENV_FILE] [--require-release]" >&2
+if [[ "$mode" != "" && "$mode" != "--require-release" &&
+  "$mode" != "--require-server-release" ]]; then
+  echo "Usage: $0 [ENV_FILE] [--require-release|--require-server-release]" >&2
   exit 2
 fi
 
@@ -301,7 +302,13 @@ elif all_set ANDROID_APP_LINKS_PACKAGE_NAME ANDROID_APP_LINKS_SHA256_CERT_FINGER
   elif [[ "$deployment_env" != production ]]; then
     ready "Android App Links" "package and signing fingerprints match this environment"
   elif ! is_set ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS; then
-    missing "Android App Links" "production requires the Play App Signing SHA-256 fingerprint"
+    if [[ "$mode" == "--require-server-release" ]]; then
+      ready "Android App Links" \
+        "pre-Play server release publishes the verified upload certificate"
+    else
+      missing "Android App Links" \
+        "production requires the Play App Signing SHA-256 fingerprint"
+    fi
   elif ! valid_sha256_fingerprint_list \
     "$(value ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS)"; then
     invalid "Android App Links" "Play App Signing fingerprints are malformed"
@@ -367,6 +374,7 @@ fi
 printf '\nEnvironment readiness: %d blocking item(s), %d local-only warning(s).\n' \
   "$failures" "$warnings"
 
-if [[ "$mode" == "--require-release" && ($failures -ne 0 || $warnings -ne 0) ]]; then
+if [[ "$mode" =~ ^--require-(release|server-release)$ &&
+  ($failures -ne 0 || $warnings -ne 0) ]]; then
   exit 1
 fi
diff --git a/scripts/production-release-remote.sh b/scripts/production-release-remote.sh
index 8adb6b9..a245eff 100755
--- a/scripts/production-release-remote.sh
+++ b/scripts/production-release-remote.sh
@@ -79,7 +79,8 @@ current_commit=$(git -C "$root" rev-parse --verify HEAD)
   exit 2
 }
 
-"$root/scripts/validate-production-env.sh" "$env_file" "$expected_domain" >/dev/null
+"$root/scripts/validate-production-env.sh" \
+  "$env_file" "$expected_domain" --allow-pre-play >/dev/null
 "$root/scripts/compose.sh" "$env_file" config --quiet
 
 case "$app_topology" in
@@ -295,10 +296,12 @@ else
   git -C "$root" checkout --detach "$release_ref"
 fi
 
-"$root/scripts/set-deployment-revision.sh" "$env_file"
+"$root/scripts/set-deployment-revision.sh" "$env_file" --allow-pre-play
 revision_changed=true
-"$root/scripts/validate-production-env.sh" "$env_file" "$expected_domain"
-"$root/scripts/check-environment-readiness.sh" "$env_file" --require-release
+"$root/scripts/validate-production-env.sh" \
+  "$env_file" "$expected_domain" --allow-pre-play
+"$root/scripts/check-environment-readiness.sh" \
+  "$env_file" --require-server-release
 
 "$root/scripts/compose.sh" "$env_file" build "${build_services[@]}"
 
diff --git a/scripts/production-release.sh b/scripts/production-release.sh
index caa41ba..1e09fc3 100755
--- a/scripts/production-release.sh
+++ b/scripts/production-release.sh
@@ -79,7 +79,7 @@ if ! ssh -o BatchMode=yes "$ssh_target" \
 fi
 
 if ! ssh -o BatchMode=yes "$ssh_target" \
-  "bash -s -- '$remote_root/.env' --require-release" \
+  "bash -s -- '$remote_root/.env' --require-server-release" \
   <"$ROOT/scripts/check-environment-readiness.sh"; then
   plan_failed=1
 fi
diff --git a/scripts/production-rollback-remote.sh b/scripts/production-rollback-remote.sh
index bdfe4fc..75c50e6 100755
--- a/scripts/production-rollback-remote.sh
+++ b/scripts/production-rollback-remote.sh
@@ -109,7 +109,8 @@ public_origin=$(read_unique "$env_file" WNH_BASE_URL)
   exit 2
 }
 
-"$root/scripts/validate-production-env.sh" "$env_file" "$expected_domain" >/dev/null
+"$root/scripts/validate-production-env.sh" \
+  "$env_file" "$expected_domain" --allow-pre-play >/dev/null
 "$root/scripts/compose.sh" "$env_file" config --quiet
 
 previous_commit=$(read_unique "$manifest" previous_commit)
diff --git a/scripts/quality.sh b/scripts/quality.sh
index cfc50ef..7fbdd84 100755
--- a/scripts/quality.sh
+++ b/scripts/quality.sh
@@ -784,6 +784,10 @@ if ./scripts/check-environment-readiness.sh \
   echo "Environment readiness accepted upload-only Android App Links." >&2
   exit 1
 fi
+./scripts/validate-production-env.sh \
+  "$upload_only_app_links_env" help.test --allow-pre-play >/dev/null
+./scripts/check-environment-readiness.sh \
+  "$upload_only_app_links_env" --require-server-release >/dev/null
 
 unpublished_play_app_links_env="$scan_dir/production.unpublished-play-app-links.env"
 cp "$production_env" "$unpublished_play_app_links_env"
@@ -800,6 +804,18 @@ if ./scripts/check-environment-readiness.sh \
   echo "Environment readiness accepted an unpublished Play App Signing fingerprint." >&2
   exit 1
 fi
+if ./scripts/validate-production-env.sh \
+  "$unpublished_play_app_links_env" help.test \
+  --allow-pre-play >/dev/null 2>&1; then
+  echo "Pre-Play validation accepted an unpublished Play App Signing fingerprint." >&2
+  exit 1
+fi
+if ./scripts/check-environment-readiness.sh \
+  "$unpublished_play_app_links_env" \
+  --require-server-release >/dev/null 2>&1; then
+  echo "Server-release readiness accepted an unpublished Play App Signing fingerprint." >&2
+  exit 1
+fi
 
 grep -Fx 'COMPOSE_PROJECT_NAME=who_need_help_production' "$production_env" >/dev/null
 grep -E '^APP_IMAGE=who-need-help:production-[0-9a-f]{12}$' "$production_env" >/dev/null
diff --git a/scripts/set-deployment-revision.sh b/scripts/set-deployment-revision.sh
index 0da0784..3caa023 100755
--- a/scripts/set-deployment-revision.sh
+++ b/scripts/set-deployment-revision.sh
@@ -4,6 +4,15 @@ umask 077
 
 ROOT=$(CDPATH='' cd -- "$(dirname -- "$0")/.." && pwd)
 env_file=${1:-"$ROOT/.env"}
+validation_mode=${2:-}
+
+case "$validation_mode" in
+  '' | --allow-pre-play) ;;
+  *)
+    echo "Usage: $0 [ENV_FILE] [--allow-pre-play]" >&2
+    exit 1
+    ;;
+esac
 
 case "$env_file" in
   /*) ;;
@@ -95,7 +104,14 @@ trap - EXIT HUP INT TERM
 
 case "$deployment_env" in
   test) "$ROOT/scripts/validate-test-env.sh" "$env_file" "$domain" ;;
-  production) "$ROOT/scripts/validate-production-env.sh" "$env_file" "$domain" ;;
+  production)
+    if [ -n "$validation_mode" ]; then
+      "$ROOT/scripts/validate-production-env.sh" \
+        "$env_file" "$domain" "$validation_mode"
+    else
+      "$ROOT/scripts/validate-production-env.sh" "$env_file" "$domain"
+    fi
+    ;;
 esac
 
 echo "Selected $deployment_env deployment revision $git_sha without rotating secrets."
diff --git a/scripts/validate-android-environment.sh b/scripts/validate-android-environment.sh
index dd1bfcb..8e73628 100755
--- a/scripts/validate-android-environment.sh
+++ b/scripts/validate-android-environment.sh
@@ -58,6 +58,27 @@ read_unique() {
   printf '%s' "$output"
 }
 
+read_optional_unique() {
+  local key=$1
+
+  awk -v key="$key" '
+    index($0, key "=") == 1 {
+      count += 1
+      value = substr($0, length(key) + 2)
+    }
+    END {
+      if (count != 1) exit 1
+      if (value ~ /^".*"$/ || value ~ /^'\''.*'\''$/) {
+        value = substr(value, 2, length(value) - 2)
+      }
+      print value
+    }
+  ' "$env_file" || {
+    echo "$key must occur exactly once in $env_file." >&2
+    exit 1
+  }
+}
+
 deployment_environment=$(read_unique DEPLOYMENT_ENV)
 phx_host=$(read_unique PHX_HOST)
 phx_scheme=$(read_unique PHX_SCHEME)
@@ -70,7 +91,7 @@ app_links_fingerprints=$(read_unique ANDROID_APP_LINKS_SHA256_CERT_FINGERPRINTS)
 play_app_signing_fingerprints=
 if [[ "$expected_environment" == production ]]; then
   play_app_signing_fingerprints=$(
-    read_unique ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS
+    read_optional_unique ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS
   )
 fi
 
@@ -131,7 +152,8 @@ for fingerprint in "${fingerprints[@]}"; do
   }
 done
 
-if [[ "$expected_environment" == production ]]; then
+if [[ "$expected_environment" == production &&
+  -n "$play_app_signing_fingerprints" ]]; then
   IFS=',' read -r -a play_fingerprints <<<"$play_app_signing_fingerprints"
   for play_fingerprint in "${play_fingerprints[@]}"; do
     compact_play=${play_fingerprint//:/}
diff --git a/scripts/validate-production-env.sh b/scripts/validate-production-env.sh
index 5cb2287..dd3b5b8 100755
--- a/scripts/validate-production-env.sh
+++ b/scripts/validate-production-env.sh
@@ -4,9 +4,10 @@ set -euo pipefail
 ROOT=$(CDPATH='' cd -- "$(dirname -- "$0")/.." && pwd)
 env_file=${1:-}
 expected_domain=${2:-}
+android_release_mode=${3:-}
 
 usage() {
-  echo "Usage: $0 ENV_FILE EXPECTED_DOMAIN" >&2
+  echo "Usage: $0 ENV_FILE EXPECTED_DOMAIN [--allow-pre-play]" >&2
 }
 
 if [[ -z "$env_file" || -z "$expected_domain" ]]; then
@@ -14,6 +15,12 @@ if [[ -z "$env_file" || -z "$expected_domain" ]]; then
   exit 1
 fi
 
+if [[ -n "$android_release_mode" &&
+  "$android_release_mode" != "--allow-pre-play" ]]; then
+  usage
+  exit 1
+fi
+
 if [[ ! -f "$env_file" ]]; then
   echo "Deployment environment does not exist: $env_file" >&2
   exit 1
@@ -497,11 +504,15 @@ if [[ -n "$android_app_links_package_name" ||
   -n "$android_app_links_fingerprints" ||
   -n "$android_play_app_signing_fingerprints" ]]; then
   [[ -n "$android_app_links_package_name" &&
-    -n "$android_app_links_fingerprints" &&
-    -n "$android_play_app_signing_fingerprints" ]] || {
-    echo "Production Android App Links require the package, published fingerprints, and Play App Signing fingerprints together." >&2
+    -n "$android_app_links_fingerprints" ]] || {
+    echo "Production Android App Links require the package and published fingerprints together." >&2
     exit 1
   }
+  if [[ -z "$android_play_app_signing_fingerprints" &&
+    "$android_release_mode" != "--allow-pre-play" ]]; then
+    echo "Production Android App Links require Play App Signing fingerprints for full release readiness." >&2
+    exit 1
+  fi
   [[ "$android_app_links_package_name" =~ ^[A-Za-z][A-Za-z0-9_]*(\.[A-Za-z][A-Za-z0-9_]*)+$ ]] || {
     echo "ANDROID_APP_LINKS_PACKAGE_NAME is not a valid Android application ID." >&2
     exit 1
@@ -525,33 +536,35 @@ if [[ -n "$android_app_links_package_name" ||
     }
   done
 
-  IFS=',' read -r -a play_fingerprints <<<"$android_play_app_signing_fingerprints"
-  [[ ${#play_fingerprints[@]} -gt 0 ]] || {
-    echo "ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS is empty." >&2
-    exit 1
-  }
-  for play_fingerprint in "${play_fingerprints[@]}"; do
-    compact_play_fingerprint=${play_fingerprint//:/}
-    compact_play_fingerprint=${compact_play_fingerprint//[[:space:]]/}
-    [[ "$compact_play_fingerprint" =~ ^[0-9A-Fa-f]{64}$ ]] || {
-      echo "ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS contains an invalid SHA-256 fingerprint." >&2
+  if [[ -n "$android_play_app_signing_fingerprints" ]]; then
+    IFS=',' read -r -a play_fingerprints <<<"$android_play_app_signing_fingerprints"
+    [[ ${#play_fingerprints[@]} -gt 0 ]] || {
+      echo "ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS is empty." >&2
       exit 1
     }
+    for play_fingerprint in "${play_fingerprints[@]}"; do
+      compact_play_fingerprint=${play_fingerprint//:/}
+      compact_play_fingerprint=${compact_play_fingerprint//[[:space:]]/}
+      [[ "$compact_play_fingerprint" =~ ^[0-9A-Fa-f]{64}$ ]] || {
+        echo "ANDROID_PLAY_APP_SIGNING_SHA256_CERT_FINGERPRINTS contains an invalid SHA-256 fingerprint." >&2
+        exit 1
+      }
 
-    play_fingerprint_found=false
-    for fingerprint in "${android_fingerprints[@]}"; do
-      compact_fingerprint=${fingerprint//:/}
-      compact_fingerprint=${compact_fingerprint//[[:space:]]/}
-      if [[ "${compact_fingerprint^^}" == "${compact_play_fingerprint^^}" ]]; then
-        play_fingerprint_found=true
-        break
-      fi
+      play_fingerprint_found=false
+      for fingerprint in "${android_fingerprints[@]}"; do
+        compact_fingerprint=${fingerprint//:/}
+        compact_fingerprint=${compact_fingerprint//[[:space:]]/}
+        if [[ "${compact_fingerprint^^}" == "${compact_play_fingerprint^^}" ]]; then
+          play_fingerprint_found=true
+          break
+        fi
+      done
+      [[ "$play_fingerprint_found" == true ]] || {
+        echo "Every Play App Signing fingerprint must also be published in ANDROID_APP_LINKS_SHA256_CERT_FINGERPRINTS." >&2
+        exit 1
+      }
     done
-    [[ "$play_fingerprint_found" == true ]] || {
-      echo "Every Play App Signing fingerprint must also be published in ANDROID_APP_LINKS_SHA256_CERT_FINGERPRINTS." >&2
-      exit 1
-    }
-  done
+  fi
 fi
 
 case "$codex_session_id" in