Format GPG errors (bug#9255).

* epg.el (epg--status-KEYEXPIRED, epg--status-KEYREVOKED): Fix typo.
(epg-error-to-string, epg-errors-to-string): New function.
(epg-wait-for-completion): Reverse errors list.
(epg--check-error-for-decrypt, epg-sign-file, epg-sign-string)
(epg-encrypt-file, epg-encrypt-string, epg-export-keys-to-file)
(epg--import-keys-1, epg-receive-keys, epg-delete-keys)
(epg-sign-keys, epg-generate-key-from-file)
(epg-generate-key-from-string): Format errors by using
epg-errors-to-string (bug#9255).
(epg--status-INV_SGNR, epg--status-NO_SGNR): New status handler.

2 files changed, 170 insertions, 70 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 52f51c918a0..d2ea294d2d0 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,16 @@
+2011-08-08  Daiki Ueno  <ueno@unixuser.org>
+
+        * epg.el (epg--status-KEYEXPIRED, epg--status-KEYREVOKED): Fix typo.
+        (epg-error-to-string, epg-errors-to-string): New function.
+        (epg-wait-for-completion): Reverse errors list.
+        (epg--check-error-for-decrypt, epg-sign-file, epg-sign-string)
+        (epg-encrypt-file, epg-encrypt-string, epg-export-keys-to-file)
+        (epg--import-keys-1, epg-receive-keys, epg-delete-keys)
+        (epg-sign-keys, epg-generate-key-from-file)
+        (epg-generate-key-from-string): Format errors by using
+        epg-errors-to-string (bug#9255).
+        (epg--status-INV_SGNR, epg--status-NO_SGNR): New status handler.
+
 2011-08-07  Juri Linkov  <juri@jurta.org>
 
         * faces.el (list-faces-display): Remove extra angle bracket
diff --git a/lisp/epg.el b/lisp/epg.el
index 348ad970b14..9ca07e213b4 100644
--- a/lisp/epg.el
+++ b/lisp/epg.el
@@ -1069,6 +1069,59 @@ This function is for internal use only."
               (format " secret keys unchanged: %d\n"
                       (epg-import-result-secret-unchanged import-result)))))
 
+(defun epg-error-to-string (error)
+  (cond
+   ((eq (car error) 'exit)
+    "Exit")
+   ((eq (car error) 'quit)
+    "Cancelled")
+   ((eq (car error) 'no-data)
+    (let ((entry (assq (cdr error) epg-no-data-reason-alist)))
+      (if entry
+          (format "No data (%s)" (downcase (cdr entry)))
+        "No data")))
+   ((eq (car error) 'unexpected)
+    (let ((entry (assq (cdr error) epg-unexpected-reason-alist)))
+      (if entry
+          (format "Unexpected (%s)" (downcase (cdr entry)))
+        "Unexpected")))
+   ((eq (car error) 'bad-armor)
+    "Bad armor")
+   ((memq (car error) '(invalid-recipient invalid-signer))
+    (concat
+     (if (eq (car error) 'invalid-recipient)
+         "Unusable public key"
+       "Unusable secret key")
+     (let ((entry (assq 'requested (cdr error))))
+       (if entry
+           (format ": %s" (cdr entry))
+         ": <unknown>"))
+     (let ((entry (assq 'reason (cdr error))))
+       (if (and entry
+                (> (cdr entry) 0)       ;no specific reason given
+                (setq entry (assq (cdr entry)
+                                  epg-invalid-recipients-reason-alist)))
+           (format " (%s)" (downcase (cdr entry)))
+         ""))))
+   ((eq (car error) 'no-pubkey)
+    (format "No public key: %s" (cdr error)))
+   ((eq (car error) 'no-seckey)
+    (format "No secret key: %s" (cdr error)))
+   ((eq (car error) 'no-recipients)
+    "No recipients")
+   ((eq (car error) 'no-signers)
+    "No signers")
+   ((eq (car error) 'delete-problem)
+    (let ((entry (assq (cdr error) epg-delete-problem-reason-alist)))
+      (if entry
+          (format "Delete problem (%s)" (downcase (cdr entry)))
+        "Delete problem")))
+   ((eq (car error) 'key-not-created)
+    "Key not created")))
+
+(defun epg-errors-to-string (errors)
+  (mapconcat #'epg-error-to-string errors "; "))
+
 (defun epg--start (context args)
   "Start `epg-gpg-program' in a subprocess with given ARGS."
   (if (and (epg-context-process context)
@@ -1195,7 +1248,7 @@ This function is for internal use only."
     (if epg-pending-status-list
         (epg-context-set-result-for
          context 'error
-         (cons (list 'exit)
+         (cons '(exit)
                (epg-context-result-for context 'error))))))
 
 (defun epg-wait-for-completion (context)
@@ -1203,7 +1256,10 @@ This function is for internal use only."
   (while (eq (process-status (epg-context-process context)) 'run)
     (accept-process-output (epg-context-process context) 1))
   ;; This line is needed to run the process-filter right now.
-  (sleep-for 0.1))
+  (sleep-for 0.1)
+  (epg-context-set-result-for
+   context 'error
+   (nreverse (epg-context-result-for context 'error))))
 
 (defun epg-reset (context)
   "Reset the CONTEXT."
@@ -1399,11 +1455,22 @@ This function is for internal use only."
   (epg--status-*SIG context 'bad string))
 
 (defun epg--status-NO_PUBKEY (context string)
-  (let ((signature (car (epg-context-result-for context 'verify))))
-    (if (and signature
-             (eq (epg-signature-status signature) 'error)
-             (equal (epg-signature-key-id signature) string))
-        (epg-signature-set-status signature 'no-pubkey))))
+  (if (eq (epg-context-operation context) 'verify)
+      (let ((signature (car (epg-context-result-for context 'verify))))
+        (if (and signature
+                 (eq (epg-signature-status signature) 'error)
+                 (equal (epg-signature-key-id signature) string))
+            (epg-signature-set-status signature 'no-pubkey)))
+    (epg-context-set-result-for
+     context 'error
+     (cons (cons 'no-pubkey string)
+           (epg-context-result-for context 'error)))))
+
+(defun epg--status-NO_SECKEY (context string)
+  (epg-context-set-result-for
+   context 'error
+   (cons (cons 'no-seckey string)
+         (epg-context-result-for context 'error))))
 
 (defun epg--time-from-seconds (seconds)
   (let ((number-seconds (string-to-number (concat seconds ".0"))))
@@ -1564,13 +1631,13 @@ This function is for internal use only."
    context 'key
    (cons (list 'key-expired (cons 'expiration-time
                                   (epg--time-from-seconds string)))
-         (epg-context-result-for context 'error))))
+         (epg-context-result-for context 'key))))
 
 (defun epg--status-KEYREVOKED (context _string)
   (epg-context-set-result-for
    context 'key
    (cons '(key-revoked)
-         (epg-context-result-for context 'error))))
+         (epg-context-result-for context 'key))))
 
 (defun epg--status-BADARMOR (context _string)
   (epg-context-set-result-for
@@ -1585,7 +1652,18 @@ This function is for internal use only."
        (cons (list 'invalid-recipient
                    (cons 'reason
                          (string-to-number (match-string 1 string)))
-                   (cons 'requested-recipient
+                   (cons 'requested
+                         (match-string 2 string)))
+             (epg-context-result-for context 'error)))))
+
+(defun epg--status-INV_SGNR (context string)
+  (if (string-match "\\`\\([0-9]+\\) \\(.*\\)" string)
+      (epg-context-set-result-for
+       context 'error
+       (cons (list 'invalid-signer
+                   (cons 'reason
+                         (string-to-number (match-string 1 string)))
+                   (cons 'requested
                          (match-string 2 string)))
              (epg-context-result-for context 'error)))))
 
@@ -1595,6 +1673,12 @@ This function is for internal use only."
    (cons '(no-recipients)
          (epg-context-result-for context 'error))))
 
+(defun epg--status-NO_SGNR (context _string)
+  (epg-context-set-result-for
+   context 'error
+   (cons '(no-signers)
+         (epg-context-result-for context 'error))))
+
 (defun epg--status-DELETE_PROBLEM (context string)
   (if (string-match "\\`\\([0-9]+\\)" string)
       (epg-context-set-result-for
@@ -1960,17 +2044,13 @@ If you are unsure, use synchronous version of this function
     (epg-wait-for-status context '("BEGIN_DECRYPTION"))))
 
 (defun epg--check-error-for-decrypt (context)
-  (if (epg-context-result-for context 'decryption-failed)
-      (signal 'epg-error (list "Decryption failed")))
-  (if (epg-context-result-for context 'no-secret-key)
-      (signal 'epg-error
-              (list "No secret key"
-                    (epg-context-result-for context 'no-secret-key))))
+  (let ((errors (epg-context-result-for context 'error)))
+    (if (epg-context-result-for context 'decryption-failed)
+        (signal 'epg-error
+                (list "Decryption failed" (epg-errors-to-string errors))))
     (unless (epg-context-result-for context 'decryption-okay)
-      (let* ((error (epg-context-result-for context 'error)))
-        (if (assq 'no-data error)
-            (signal 'epg-error (list "No data")))
-        (signal 'epg-error (list "Can't decrypt" error)))))
+      (signal 'epg-error
+              (list "Can't decrypt" (epg-errors-to-string errors))))))
 
 (defun epg-decrypt-file (context cipher plain)
   "Decrypt a file CIPHER and store the result to a file PLAIN.
@@ -2165,10 +2245,9 @@ Otherwise, it makes a cleartext signature."
         (epg-start-sign context (epg-make-data-from-file plain) mode)
         (epg-wait-for-completion context)
         (unless (epg-context-result-for context 'sign)
-          (if (epg-context-result-for context 'error)
-              (error "Sign failed: %S"
-                     (epg-context-result-for context 'error))
-            (error "Sign failed")))
+          (let ((errors (epg-context-result-for context 'error)))
+            (signal 'epg-error
+                    (list "Sign failed" (epg-errors-to-string errors)))))
         (unless signature
           (epg-read-output context)))
     (unless signature
@@ -2203,9 +2282,9 @@ Otherwise, it makes a cleartext signature."
           (epg-wait-for-completion context)
           (unless (epg-context-result-for context 'sign)
             (if (epg-context-result-for context 'error)
-                (error "Sign failed: %S"
-                       (epg-context-result-for context 'error))
-              (error "Sign failed")))
+                (let ((errors (epg-context-result-for context 'error)))
+                  (signal 'epg-error
+                          (list "Sign failed" (epg-errors-to-string errors))))))
           (epg-read-output context))
       (epg-delete-output-file context)
       (if input-file
@@ -2276,15 +2355,14 @@ If RECIPIENTS is nil, it performs symmetric encryption."
         (epg-start-encrypt context (epg-make-data-from-file plain)
                            recipients sign always-trust)
         (epg-wait-for-completion context)
-        (if (and sign
-                 (not (epg-context-result-for context 'sign)))
-            (if (epg-context-result-for context 'error)
-                (error "Sign failed: %S"
-                       (epg-context-result-for context 'error))
-                (error "Sign failed")))
-        (if (epg-context-result-for context 'error)
-            (error "Encrypt failed: %S"
-                   (epg-context-result-for context 'error)))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if (and sign
+                   (not (epg-context-result-for context 'sign)))
+              (signal 'epg-error
+                      (list "Sign failed" (epg-errors-to-string errors))))
+          (if errors
+              (signal 'epg-error
+                      (list "Encrypt failed" (epg-errors-to-string errors)))))
         (unless cipher
           (epg-read-output context)))
     (unless cipher
@@ -2317,15 +2395,14 @@ If RECIPIENTS is nil, it performs symmetric encryption."
                                (epg-make-data-from-string plain))
                              recipients sign always-trust)
           (epg-wait-for-completion context)
-          (if (and sign
-                   (not (epg-context-result-for context 'sign)))
-              (if (epg-context-result-for context 'error)
-                  (error "Sign failed: %S"
-                         (epg-context-result-for context 'error))
-                (error "Sign failed")))
-          (if (epg-context-result-for context 'error)
-              (error "Encrypt failed: %S"
-                     (epg-context-result-for context 'error)))
+          (let ((errors (epg-context-result-for context 'error)))
+            (if (and sign
+                     (not (epg-context-result-for context 'sign)))
+                (signal 'epg-error
+                        (list "Sign failed" (epg-errors-to-string errors))))
+            (if errors
+                (signal 'epg-error
+                        (list "Encrypt failed" (epg-errors-to-string errors)))))
           (epg-read-output context))
       (epg-delete-output-file context)
       (if input-file
@@ -2359,9 +2436,11 @@ If you are unsure, use synchronous version of this function
                                        (epg--make-temp-file "epg-output")))
         (epg-start-export-keys context keys)
         (epg-wait-for-completion context)
-        (if (epg-context-result-for context 'error)
-            (error "Export keys failed: %S"
-                   (epg-context-result-for context 'error)))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Export keys failed"
+                            (epg-errors-to-string errors)))))
         (unless file
           (epg-read-output context)))
     (unless file
@@ -2398,9 +2477,11 @@ If you are unsure, use synchronous version of this function
       (progn
         (epg-start-import-keys context keys)
         (epg-wait-for-completion context)
-        (if (epg-context-result-for context 'error)
-            (error "Import keys failed: %S"
-                   (epg-context-result-for context 'error))))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Import keys failed"
+                            (epg-errors-to-string errors))))))
     (epg-reset context)))
 
 (defun epg-import-keys-from-file (context keys)
@@ -2431,9 +2512,11 @@ KEYS is a list of key IDs"
       (progn
         (epg-start-receive-keys context keys)
         (epg-wait-for-completion context)
-        (if (epg-context-result-for context 'error)
-            (error "Receive keys failed: %S"
-                   (epg-context-result-for context 'error))))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Receive keys failed"
+                            (epg-errors-to-string errors))))))
     (epg-reset context)))
 
 (defalias 'epg-import-keys-from-server 'epg-receive-keys)
@@ -2463,13 +2546,11 @@ If you are unsure, use synchronous version of this function
       (progn
         (epg-start-delete-keys context keys allow-secret)
         (epg-wait-for-completion context)
-        (let ((entry (assq 'delete-problem
-                           (epg-context-result-for context 'error))))
-          (if entry
-              (if (setq entry (assq (cdr entry)
-                                    epg-delete-problem-reason-alist))
-                  (error "Delete keys failed: %s" (cdr entry))
-                (error "Delete keys failed")))))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Delete keys failed"
+                            (epg-errors-to-string errors))))))
     (epg-reset context)))
 
 (defun epg-start-sign-keys (context keys &optional local)
@@ -2498,9 +2579,11 @@ If you are unsure, use synchronous version of this function
       (progn
         (epg-start-sign-keys context keys local)
         (epg-wait-for-completion context)
-        (if (epg-context-result-for context 'error)
-            (error "Sign keys failed: %S"
-                   (epg-context-result-for context 'error))))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Sign keys failed"
+                            (epg-errors-to-string errors))))))
     (epg-reset context)))
 (make-obsolete 'epg-sign-keys "do not use." "23.1")
 
@@ -2532,9 +2615,11 @@ PARAMETERS is a file which tells how to create the key."
       (progn
         (epg-start-generate-key context (epg-make-data-from-file parameters))
         (epg-wait-for-completion context)
-        (if (epg-context-result-for context 'error)
-            (error "Generate key failed: %S"
-                   (epg-context-result-for context 'error))))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Generate key failed"
+                            (epg-errors-to-string errors))))))
     (epg-reset context)))
 
 (defun epg-generate-key-from-string (context parameters)
@@ -2544,9 +2629,11 @@ PARAMETERS is a string which tells how to create the key."
       (progn
         (epg-start-generate-key context (epg-make-data-from-string parameters))
         (epg-wait-for-completion context)
-        (if (epg-context-result-for context 'error)
-            (error "Generate key failed: %S"
-                   (epg-context-result-for context 'error))))
+        (let ((errors (epg-context-result-for context 'error)))
+          (if errors
+              (signal 'epg-error
+                      (list "Generate key failed"
+                            (epg-errors-to-string errors))))))
     (epg-reset context)))
 
 (defun epg--decode-percent-escape (string)