feat: standard TBC secrets decoding

templates/gitlab-ci-renovate.yml

@@ -211,7 +211,79 @@ variables:
     log_info "... done"
   }
 
+  # evaluate and export a secret
+  # - $1: secret variable name
+  function eval_secret() {
+    name=$1
+    value=$(eval echo "\$${name}")
+    case "$value" in
+    @b64@*)
+      decoded=$(mktemp)
+      errors=$(mktemp)
+      if echo "$value" | cut -c6- | base64 -d > "${decoded}" 2> "${errors}"
+      then
+        # shellcheck disable=SC2086
+        export ${name}="$(cat ${decoded})"
+        log_info "Successfully decoded base64 secret \\e[33;1m${name}\\e[0m"
+      else
+        fail "Failed decoding base64 secret \\e[33;1m${name}\\e[0m:\\n$(sed 's/^/... /g' "${errors}")"
+      fi
+      ;;
+    @hex@*)
+      decoded=$(mktemp)
+      errors=$(mktemp)
+      if echo "$value" | cut -c6- | sed 's/\([0-9A-F]\{2\}\)/\\\\x\1/gI' | xargs printf > "${decoded}" 2> "${errors}"
+      then
+        # shellcheck disable=SC2086
+        export ${name}="$(cat ${decoded})"
+        log_info "Successfully decoded hexadecimal secret \\e[33;1m${name}\\e[0m"
+      else
+        fail "Failed decoding hexadecimal secret \\e[33;1m${name}\\e[0m:\\n$(sed 's/^/... /g' "${errors}")"
+      fi
+      ;;
+    @url@*)
+      url=$(echo "$value" | cut -c6-)
+      if command -v curl > /dev/null
+      then
+        decoded=$(mktemp)
+        errors=$(mktemp)
+        if curl -s -S -f --connect-timeout 5 -o "${decoded}" "$url" 2> "${errors}"
+        then
+          # shellcheck disable=SC2086
+          export ${name}="$(cat ${decoded})"
+          log_info "Successfully curl'd secret \\e[33;1m${name}\\e[0m"
+        else
+          log_warn "Failed getting secret \\e[33;1m${name}\\e[0m:\\n$(sed 's/^/... /g' "${errors}")"
+        fi
+      elif command -v wget > /dev/null
+      then
+        decoded=$(mktemp)
+        errors=$(mktemp)
+        if wget -T 5 -O "${decoded}" "$url" 2> "${errors}"
+        then
+          # shellcheck disable=SC2086
+          export ${name}="$(cat ${decoded})"
+          log_info "Successfully wget'd secret \\e[33;1m${name}\\e[0m"
+        else
+          log_warn "Failed getting secret \\e[33;1m${name}\\e[0m:\\n$(sed 's/^/... /g' "${errors}")"
+        fi
+      else
+        fail "Couldn't get secret \\e[33;1m${name}\\e[0m: no http client found"
+      fi
+      ;;
+    esac
+  }
+
+  function eval_all_secrets() {
+    encoded_vars=$(env | grep -v '^scoped__' | awk -F '=' '/^[a-zA-Z0-9_]*=@(b64|hex|url)@/ {print $1}')
+    for var in $encoded_vars
+    do
+      eval_secret "$var"
+    done
+  }
+
   unscope_variables
+  eval_all_secrets
 
   # ENDSCRIPT