immich-upload: auto-detect LAN vs public ingress

Probe the LAN /api/server/ping endpoint with a short timeout and use it
when reachable, otherwise fall back to the public HTTPS URL. Fixes the
indefinite hang when running off the home LAN.

Amp-Thread-ID: https://ampcode.com/threads/T-019ed713-5af1-72a2-8a4e-27ee32c1d6d5
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 28 insertions, 2 deletions

diff --git a/scripts/immich-upload b/scripts/immich-upload
index 9cc616f..a780730 100755
--- a/scripts/immich-upload
+++ b/scripts/immich-upload
@@ -8,8 +8,9 @@
 
 set -euo pipefail
 
-IMMICH_URL="http://immich.f3s.lan.buetow.org"
-# IMMICH_URL="http://immich.f3s.buetow.org"
+IMMICH_LAN_URL="http://immich.f3s.lan.buetow.org"   # LAN-only, fast when on home network
+IMMICH_PUBLIC_URL="https://immich.f3s.buetow.org"   # public, works from anywhere
+IMMICH_URL=""                                        # auto-detected in main()
 API_KEY_FILE="$HOME/.immich_paul_key"
 
 # Supported image extensions (case-insensitive)
@@ -25,6 +26,29 @@ warn() { echo "WARN: $1" >&2; }
 
 info() { echo "==> $1"; }
 
+# Probe the Immich /api/server/ping endpoint at the given base URL.
+# Returns success only on HTTP 200 within a short timeout (follows redirects).
+immich_reachable() {
+    local url="$1"
+    local code
+    code=$(curl -sL -m 5 -o /dev/null -w '%{http_code}' \
+        "$url/api/server/ping" 2>/dev/null) || return 1
+    [[ "$code" == "200" ]]
+}
+
+# Pick the LAN URL if reachable, otherwise fall back to the public URL.
+detect_immich_url() {
+    if immich_reachable "$IMMICH_LAN_URL"; then
+        IMMICH_URL="$IMMICH_LAN_URL"
+        info "Using LAN ingress: $IMMICH_URL"
+    elif immich_reachable "$IMMICH_PUBLIC_URL"; then
+        IMMICH_URL="$IMMICH_PUBLIC_URL"
+        info "LAN ingress unreachable, using public ingress: $IMMICH_URL"
+    else
+        die "Immich is not reachable via LAN ($IMMICH_LAN_URL) or public ($IMMICH_PUBLIC_URL)"
+    fi
+}
+
 # Compute SHA1 (hex, lowercase) for a file.
 file_sha1() {
     sha1sum "$1" | awk '{print $1}'
@@ -233,6 +257,8 @@ main() {
         die "API key file is empty: $API_KEY_FILE"
     fi
 
+    detect_immich_url
+
     if [[ -f "$src" ]]; then
         # Single file upload
         info "Uploading single file: $src"