feat: add ability to specify oauth2 config files

'MOODLE_OAUTH2_CONFIG_..' variables may now end in '_FILE' (or just 'MOODLE_OAUTH2_CONFIG_FILE' for a single configuration) to denote them as paths to a json file containing the configuration.

Author: hlfbt

entrypoint.d/40-oauth2.sh

@@ -1,15 +1,29 @@
 #!/bin/bash
 set -e
 
+VAR_PREFIX="MOODLE_OAUTH2_CONFIG_"
+
 if [ "$IS_WORKER" = "false" ]; then
     # Automatic OAuth2 Issuer Configuration
     # Looks for MOODLE_OAUTH2_CONFIG_JSON or MOODLE_OAUTH2_CONFIG_<NAME>
+    # Variables ending in _FILE are assumed to be paths to json configurations
     # Use 'env' to get all variables and filter
-    for var in $(env | grep ^MOODLE_OAUTH2_CONFIG_ | cut -d= -f1); do
+    for var in $(env | grep "^{$VAR_PREFIX}" | cut -d= -f1); do
         CONFIG_VAL="${!var}"
         if [ -n "$CONFIG_VAL" ]; then
-            echo "Configuring OAuth2 Issuer from $var (via stdin)..."
-            php "${MOODLE_DOCKER_ROOT}/scripts/manage_oauth2_issuer.php" <<< "$CONFIG_VAL"
+            issuer="${var:${#VAR_PREFIX}}"
+            if [ "${issuer:(-5)}" = "_FILE" ] || [ "$issuer" = "FILE" ]; then
+                [ "$issuer" = "FILE" ] && issuer="" || issuer="${issuer:0:(-5)}"
+
+                echo "Configuring OAuth2 Issuer${issuer:- }$issuer from ${CONFIG_VAL}..."
+                php "${MOODLE_DOCKER_ROOT}/scripts/manage_oauth2_issuer.php" "$CONFIG_VAL"
+            else
+                [ "$issuer" = "JSON" ] && issuer=""
+                [ "${issuer:(-5)}" = "_JSON" ] && issuer="${issuer:0:(-5)}"
+
+                echo "Configuring OAuth2 Issuer${issuer:- }$issuer from $var (via stdin)..."
+                php "${MOODLE_DOCKER_ROOT}/scripts/manage_oauth2_issuer.php" <<< "$CONFIG_VAL"
+            fi
         fi
     done