cli: use new notmuch_crypto_get_context in mime-node.c

This has the affect of lazily creating the crypto contexts only when
needed.  This removes code duplication from notmuch-show and
notmuch-reply, and should speed up these functions considerably if the
crypto flags are provided but the messages don't have any
cryptographic parts.

mime-node.c

@@ -150,6 +150,7 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 {
     mime_node_t *node = talloc_zero (parent, mime_node_t);
     GError *err = NULL;
+    notmuch_crypto_context_t *cryptoctx = NULL;
 
     /* Set basic node properties */
     node->part = part;
@@ -182,8 +183,15 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 	return NULL;
     }
 
+    if ((GMIME_IS_MULTIPART_ENCRYPTED (part) && node->ctx->crypto->decrypt)
+	|| (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify)) {
+	GMimeContentType *content_type = g_mime_object_get_content_type (part);
+	const char *protocol = g_mime_content_type_get_parameter (content_type, "protocol");
+	cryptoctx = notmuch_crypto_get_context (node->ctx->crypto, protocol);
+    }
+
     /* Handle PGP/MIME parts */
-    if (GMIME_IS_MULTIPART_ENCRYPTED (part) && node->ctx->crypto->decrypt) {
+    if (GMIME_IS_MULTIPART_ENCRYPTED (part) && node->ctx->crypto->decrypt && cryptoctx) {
 	if (node->nchildren != 2) {
 	    /* this violates RFC 3156 section 4, so we won't bother with it. */
 	    fprintf (stderr, "Error: %d part(s) for a multipart/encrypted "
@@ -196,10 +204,10 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 #ifdef GMIME_ATLEAST_26
 	    GMimeDecryptResult *decrypt_result = NULL;
 	    node->decrypted_child = g_mime_multipart_encrypted_decrypt
-		(encrypteddata, node->ctx->crypto->gpgctx, &decrypt_result, &err);
+		(encrypteddata, cryptoctx, &decrypt_result, &err);
 #else
 	    node->decrypted_child = g_mime_multipart_encrypted_decrypt
-		(encrypteddata, node->ctx->crypto->gpgctx, &err);
+		(encrypteddata, cryptoctx, &err);
 #endif
 	    if (node->decrypted_child) {
 		node->decrypt_success = node->verify_attempted = TRUE;
@@ -217,7 +225,7 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 			 (err ? err->message : "no error explanation given"));
 	    }
 	}
-    } else if (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify) {
+    } else if (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->crypto->verify && cryptoctx) {
 	if (node->nchildren != 2) {
 	    /* this violates RFC 3156 section 5, so we won't bother with it. */
 	    fprintf (stderr, "Error: %d part(s) for a multipart/signed message "
@@ -226,7 +234,7 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 	} else {
 #ifdef GMIME_ATLEAST_26
 	    node->sig_list = g_mime_multipart_signed_verify
-		(GMIME_MULTIPART_SIGNED (part), node->ctx->crypto->gpgctx, &err);
+		(GMIME_MULTIPART_SIGNED (part), cryptoctx, &err);
 	    node->verify_attempted = TRUE;
 
 	    if (!node->sig_list)
@@ -242,7 +250,7 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 	     * In GMime 2.6, they're both non-const, so we'll be able
 	     * to clean up this asymmetry. */
 	    GMimeSignatureValidity *sig_validity = g_mime_multipart_signed_verify
-		(GMIME_MULTIPART_SIGNED (part), node->ctx->crypto->gpgctx, &err);
+		(GMIME_MULTIPART_SIGNED (part), cryptoctx, &err);
 	    node->verify_attempted = TRUE;
 	    node->sig_validity = sig_validity;
 	    if (sig_validity) {

notmuch-client.h

@@ -353,7 +353,8 @@ struct mime_node {
 /* Construct a new MIME node pointing to the root message part of
  * message. If crypto->verify is true, signed child parts will be
  * verified. If crypto->decrypt is true, encrypted child parts will be
- * decrypted.
+ * decrypted.  If crypto->gpgctx is NULL, it will be lazily
+ * initialized.
  *
  * Return value:
  *

notmuch-reply.c

@@ -741,25 +741,6 @@ notmuch_reply_command (void *ctx, int argc, char *argv[])
     else
 	reply_format_func = notmuch_reply_format_default;
 
-    if (params.crypto.decrypt) {
-#ifdef GMIME_ATLEAST_26
-	/* TODO: GMimePasswordRequestFunc */
-	params.crypto.gpgctx = g_mime_gpg_context_new (NULL, "gpg");
-#else
-	GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
-	params.crypto.gpgctx = g_mime_gpg_context_new (session, "gpg");
-#endif
-	if (params.crypto.gpgctx) {
-	    g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) params.crypto.gpgctx, FALSE);
-	} else {
-	    params.crypto.decrypt = FALSE;
-	    fprintf (stderr, "Failed to construct gpg context.\n");
-	}
-#ifndef GMIME_ATLEAST_26
-	g_object_unref (session);
-#endif
-    }
-
     config = notmuch_config_open (ctx, NULL, NULL);
     if (config == NULL)
 	return 1;

notmuch-show.c

@@ -1056,29 +1056,6 @@ notmuch_show_command (void *ctx, unused (int argc), unused (char *argv[]))
 	break;
     }
 
-    if (params.crypto.decrypt || params.crypto.verify) {
-#ifdef GMIME_ATLEAST_26
-	/* TODO: GMimePasswordRequestFunc */
-	params.crypto.gpgctx = g_mime_gpg_context_new (NULL, "gpg");
-#else
-	GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
-	params.crypto.gpgctx = g_mime_gpg_context_new (session, "gpg");
-#endif
-	if (params.crypto.gpgctx) {
-	    g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) params.crypto.gpgctx, FALSE);
-	} else {
-	    /* If we fail to create the gpgctx set the verify and
-	     * decrypt flags to FALSE so we don't try to do any
-	     * further verification or decryption */
-	    params.crypto.verify = FALSE;
-	    params.crypto.decrypt = FALSE;
-	    fprintf (stderr, "Failed to construct gpg context.\n");
-	}
-#ifndef GMIME_ATLEAST_26
-	g_object_unref (session);
-#endif
-    }
-
     config = notmuch_config_open (ctx, NULL, NULL);
     if (config == NULL)
 	return 1;