refactor(auth): consolidate the auth-source secret lookup into one helper

The auth-source-search + funcall-the-secret block was copied four times: calendar-sync--calendar-url, cj/auth-source-secret (ai-config), cj/--auth-source-password (transcription), and cj/slack--get-credential. Each searched authinfo, pulled :secret, and called it when the netrc backend returned a function.

I pulled that into cj/auth-source-secret-value in system-lib (a leaf, so calendar-sync doesn't have to depend on ai-config and drag in the gptel stack). It takes an optional user and returns the secret or nil. The four callers now delegate to it: ai-config layers its required-secret error on top, and the others keep their nil-on-miss behavior. With the direct auth-source-search calls gone, I dropped the now-unused (require 'auth-source) from transcription, slack, and calendar-sync. The helper's autoload covers it.

The transcription tests that exercise the delegated path stay green, and the primitive and the error wrapper get their own tests.

1 files changed, 67 insertions, 0 deletions

diff --git a/tests/test-system-lib-auth-source-secret-value.el b/tests/test-system-lib-auth-source-secret-value.el
new file mode 100644
index 00000000..ec526cec
--- /dev/null
+++ b/tests/test-system-lib-auth-source-secret-value.el
@@ -0,0 +1,67 @@
+;;; test-system-lib-auth-source-secret-value.el --- Tests for the auth-source secret primitive -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; `cj/auth-source-secret-value' is the shared low-level accessor that the
+;; calendar-sync, ai-config, transcription, and slack helpers all delegate to.
+;; It searches authinfo for HOST (and optional USER), resolves a
+;; function-valued secret by calling it, and returns the value or nil.  These
+;; tests stub `auth-source-search' (the external boundary) and capture its args.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'system-lib)
+
+(defvar test-ass--args nil "Captured args of the stubbed `auth-source-search'.")
+
+(defmacro test-ass--with-search (return-value &rest body)
+  "Run BODY with `auth-source-search' stubbed to return RETURN-VALUE.
+Captures the call args in `test-ass--args'."
+  (declare (indent 1))
+  `(let ((test-ass--args nil))
+     (cl-letf (((symbol-function 'auth-source-search)
+                (lambda (&rest args) (setq test-ass--args args) ,return-value)))
+       ,@body)))
+
+;;; Normal
+
+(ert-deftest test-auth-source-secret-value-returns-string-secret ()
+  "Normal: a string :secret is returned as-is."
+  (test-ass--with-search (list (list :secret "sk-abc"))
+    (should (equal "sk-abc" (cj/auth-source-secret-value "api.example.com")))))
+
+(ert-deftest test-auth-source-secret-value-calls-function-secret ()
+  "Normal: a function :secret is funcalled (the netrc backend returns one)."
+  (test-ass--with-search (list (list :secret (lambda () "from-fn")))
+    (should (equal "from-fn" (cj/auth-source-secret-value "api.example.com")))))
+
+(ert-deftest test-auth-source-secret-value-passes-user-when-given ()
+  "Normal: USER and HOST are forwarded to `auth-source-search'."
+  (test-ass--with-search (list (list :secret "x"))
+    (cj/auth-source-secret-value "h" "apikey")
+    (should (equal "h" (plist-get test-ass--args :host)))
+    (should (equal "apikey" (plist-get test-ass--args :user)))))
+
+;;; Boundary
+
+(ert-deftest test-auth-source-secret-value-omits-user-when-absent ()
+  "Boundary: with no USER, :user is not added to the search spec."
+  (test-ass--with-search (list (list :secret "x"))
+    (cj/auth-source-secret-value "h")
+    (should-not (plist-member test-ass--args :user))))
+
+(ert-deftest test-auth-source-secret-value-nil-on-no-match ()
+  "Boundary: no matching entry yields nil."
+  (test-ass--with-search nil
+    (should (null (cj/auth-source-secret-value "h")))))
+
+(ert-deftest test-auth-source-secret-value-nil-on-entry-without-secret ()
+  "Boundary: a matching entry with no :secret yields nil."
+  (test-ass--with-search (list (list :host "h"))
+    (should (null (cj/auth-source-secret-value "h")))))
+
+(provide 'test-system-lib-auth-source-secret-value)
+;;; test-system-lib-auth-source-secret-value.el ends here