Add compatibility with gmime 2.6

There are lots of API changes in gmime 2.6 crypto handling. By adding
preprocessor directives, it is however possible to add gmime 2.6 compatibility
while preserving compatibility with gmime 2.4 too.

This is mostly based on id:"8762i8hrb9.fsf@bookbinder.fernseed.info".

This was tested against both gmime 2.6.4 and 2.4.31. With gmime 2.4.31, the
crypto tests all work fine (as expected). With gmime 2.6.4, one crypto test is
currently broken (signature verification with signer key unavailable), most
likely because of a bug in gmime which will hopefully be fixed in a future
version.

mime-node.c

@@ -33,7 +33,11 @@ typedef struct mime_node_context {
     GMimeMessage *mime_message;
 
     /* Context provided by the caller. */
+#ifdef GMIME_ATLEAST_26
+    GMimeCryptoContext *cryptoctx;
+#else
     GMimeCipherContext *cryptoctx;
+#endif
     notmuch_bool_t decrypt;
 } mime_node_context_t;
 
@@ -57,8 +61,12 @@ _mime_node_context_free (mime_node_context_t *res)
 
 notmuch_status_t
 mime_node_open (const void *ctx, notmuch_message_t *message,
-		GMimeCipherContext *cryptoctx, notmuch_bool_t decrypt,
+#ifdef GMIME_ATLEAST_26
-		mime_node_t **root_out)
+		GMimeCryptoContext *cryptoctx,
+#else
+		GMimeCipherContext *cryptoctx,
+#endif
+		notmuch_bool_t decrypt, mime_node_t **root_out)
 {
     const char *filename = notmuch_message_get_filename (message);
     mime_node_context_t *mctx;
@@ -112,12 +120,21 @@ DONE:
     return status;
 }
 
+#ifdef GMIME_ATLEAST_26
+static int
+_signature_list_free (GMimeSignatureList **proxy)
+{
+    g_object_unref (*proxy);
+    return 0;
+}
+#else
 static int
 _signature_validity_free (GMimeSignatureValidity **proxy)
 {
     g_mime_signature_validity_free (*proxy);
     return 0;
 }
+#endif
 
 static mime_node_t *
 _mime_node_create (const mime_node_t *parent, GMimeObject *part)
@@ -165,11 +182,25 @@ _mime_node_create (const mime_node_t *parent, GMimeObject *part)
 	    GMimeMultipartEncrypted *encrypteddata =
 		GMIME_MULTIPART_ENCRYPTED (part);
 	    node->decrypt_attempted = TRUE;
+#ifdef GMIME_ATLEAST_26
+	    GMimeDecryptResult *decrypt_result = NULL;
+	    node->decrypted_child = g_mime_multipart_encrypted_decrypt
+		(encrypteddata, node->ctx->cryptoctx, &decrypt_result, &err);
+#else
 	    node->decrypted_child = g_mime_multipart_encrypted_decrypt
 		(encrypteddata, node->ctx->cryptoctx, &err);
+#endif
 	    if (node->decrypted_child) {
 		node->decrypt_success = node->verify_attempted = TRUE;
+#ifdef GMIME_ATLEAST_26
+		/* This may be NULL if the part is not signed. */
+		node->sig_list = g_mime_decrypt_result_get_signatures (decrypt_result);
+		if (node->sig_list)
+		    g_object_ref (node->sig_list);
+		g_object_unref (decrypt_result);
+#else
 		node->sig_validity = g_mime_multipart_encrypted_get_signature_validity (encrypteddata);
+#endif
 	    } else {
 		fprintf (stderr, "Failed to decrypt part: %s\n",
 			 (err ? err->message : "no error explanation given"));
@@ -182,6 +213,15 @@ _mime_node_create (const mime_node_t *parent, GMimeObject *part)
 		     "(must be exactly 2)\n",
 		     node->nchildren);
 	} else {
+#ifdef GMIME_ATLEAST_26
+	    node->sig_list = g_mime_multipart_signed_verify
+		(GMIME_MULTIPART_SIGNED (part), node->ctx->cryptoctx, &err);
+	    node->verify_attempted = TRUE;
+
+	    if (!node->sig_list)
+		fprintf (stderr, "Failed to verify signed part: %s\n",
+			 (err ? err->message : "no error explanation given"));
+#else
 	    /* For some reason the GMimeSignatureValidity returned
 	     * here is not a const (inconsistent with that
 	     * returned by
@@ -200,12 +240,25 @@ _mime_node_create (const mime_node_t *parent, GMimeObject *part)
 		*proxy = sig_validity;
 		talloc_set_destructor (proxy, _signature_validity_free);
 	    }
+#endif
 	}
     }
 
+#ifdef GMIME_ATLEAST_26
+    /* sig_list may be created in both above cases, so we need to
+     * cleanly handle it here. */
+    if (node->sig_list) {
+	GMimeSignatureList **proxy = talloc (node, GMimeSignatureList *);
+	*proxy = node->sig_list;
+	talloc_set_destructor (proxy, _signature_list_free);
+    }
+#endif
+
+#ifndef GMIME_ATLEAST_26
     if (node->verify_attempted && !node->sig_validity)
 	fprintf (stderr, "Failed to verify signed part: %s\n",
 		 (err ? err->message : "no error explanation given"));
+#endif
 
     if (err)
 	g_error_free (err);

notmuch-client.h

@@ -30,6 +30,14 @@
 
 #include <gmime/gmime.h>
 
+/* GMIME_CHECK_VERSION in gmime 2.4 is not usable from the
+ * preprocessor (it calls a runtime function). But since
+ * GMIME_MAJOR_VERSION and friends were added in gmime 2.6, we can use
+ * these to check the version number. */
+#ifdef GMIME_MAJOR_VERSION
+#define GMIME_ATLEAST_26
+#endif
+
 #include "notmuch.h"
 
 /* This is separate from notmuch-private.h because we're trying to
@@ -69,7 +77,11 @@ typedef struct notmuch_show_format {
     void (*part_start) (GMimeObject *part,
 			int *part_count);
     void (*part_encstatus) (int status);
+#ifdef GMIME_ATLEAST_26
+    void (*part_sigstatus) (GMimeSignatureList* siglist);
+#else
     void (*part_sigstatus) (const GMimeSignatureValidity* validity);
+#endif
     void (*part_content) (GMimeObject *part);
     void (*part_end) (GMimeObject *part);
     const char *part_sep;
@@ -83,7 +95,11 @@ typedef struct notmuch_show_params {
     int entire_thread;
     int raw;
     int part;
+#ifdef GMIME_ATLEAST_26
+    GMimeCryptoContext* cryptoctx;
+#else
     GMimeCipherContext* cryptoctx;
+#endif
     int decrypt;
 } notmuch_show_params_t;
 
@@ -290,11 +306,17 @@ typedef struct mime_node {
 
     /* True if signature verification on this part was attempted. */
     notmuch_bool_t verify_attempted;
+#ifdef GMIME_ATLEAST_26
+    /* The list of signatures for signed or encrypted containers. If
+     * there are no signatures, this will be NULL. */
+    GMimeSignatureList* sig_list;
+#else
     /* For signed or encrypted containers, the validity of the
      * signature.  May be NULL if signature verification failed.  If
      * there are simply no signatures, this will be non-NULL with an
      * empty signers list. */
     const GMimeSignatureValidity *sig_validity;
+#endif
 
     /* Internal: Context inherited from the root iterator. */
     struct mime_node_context *ctx;
@@ -319,8 +341,12 @@ typedef struct mime_node {
  */
 notmuch_status_t
 mime_node_open (const void *ctx, notmuch_message_t *message,
-		GMimeCipherContext *cryptoctx, notmuch_bool_t decrypt,
+#ifdef GMIME_ATLEAST_26
-		mime_node_t **node_out);
+		GMimeCryptoContext *cryptoctx,
+#else
+		GMimeCipherContext *cryptoctx,
+#endif
+		notmuch_bool_t decrypt, mime_node_t **node_out);
 
 /* Return a new MIME node for the requested child part of parent.
  * parent will be used as the talloc context for the returned child

notmuch-reply.c

@@ -688,15 +688,22 @@ notmuch_reply_command (void *ctx, int argc, char *argv[])
 	reply_format_func = notmuch_reply_format_default;
 
     if (decrypt) {
+#ifdef GMIME_ATLEAST_26
+	/* TODO: GMimePasswordRequestFunc */
+	params.cryptoctx = g_mime_gpg_context_new (NULL, "gpg");
+#else
 	GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
 	params.cryptoctx = g_mime_gpg_context_new (session, "gpg");
+#endif
 	if (params.cryptoctx) {
 	    g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) params.cryptoctx, FALSE);
 	    params.decrypt = TRUE;
 	} else {
 	    fprintf (stderr, "Failed to construct gpg context.\n");
 	}
+#ifndef GMIME_ATLEAST_26
 	g_object_unref (session);
+#endif
     }
 
     config = notmuch_config_open (ctx, NULL, NULL);

notmuch-show.c

@@ -76,7 +76,11 @@ static void
 format_part_encstatus_json (int status);
 
 static void
+#ifdef GMIME_ATLEAST_26
+format_part_sigstatus_json (GMimeSignatureList* siglist);
+#else
 format_part_sigstatus_json (const GMimeSignatureValidity* validity);
+#endif
 
 static void
 format_part_content_json (GMimeObject *part);
@@ -486,6 +490,21 @@ show_text_part_content (GMimeObject *part, GMimeStream *stream_out)
 	g_object_unref(stream_filter);
 }
 
+#ifdef GMIME_ATLEAST_26
+static const char*
+signature_status_to_string (GMimeSignatureStatus x)
+{
+    switch (x) {
+    case GMIME_SIGNATURE_STATUS_GOOD:
+	return "good";
+    case GMIME_SIGNATURE_STATUS_BAD:
+	return "bad";
+    case GMIME_SIGNATURE_STATUS_ERROR:
+	return "error";
+    }
+    return "unknown";
+}
+#else
 static const char*
 signer_status_to_string (GMimeSignerStatus x)
 {
@@ -501,6 +520,7 @@ signer_status_to_string (GMimeSignerStatus x)
     }
     return "unknown";
 }
+#endif
 
 static void
 format_part_start_text (GMimeObject *part, int *part_count)
@@ -592,6 +612,73 @@ format_part_encstatus_json (int status)
     printf ("}]");
 }
 
+#ifdef GMIME_ATLEAST_26
+static void
+format_part_sigstatus_json (GMimeSignatureList *siglist)
+{
+    printf (", \"sigstatus\": [");
+
+    if (!siglist) {
+	printf ("]");
+	return;
+    }
+
+    void *ctx_quote = talloc_new (NULL);
+    int i;
+    for (i = 0; i < g_mime_signature_list_length (siglist); i++) {
+	GMimeSignature *signature = g_mime_signature_list_get_signature (siglist, i);
+
+	if (i > 0)
+	    printf (", ");
+
+	printf ("{");
+
+	/* status */
+	GMimeSignatureStatus status = g_mime_signature_get_status (signature);
+	printf ("\"status\": %s",
+		json_quote_str (ctx_quote,
+				signature_status_to_string (status)));
+
+	GMimeCertificate *certificate = g_mime_signature_get_certificate (signature);
+	if (status == GMIME_SIGNATURE_STATUS_GOOD) {
+	    if (certificate)
+		printf (", \"fingerprint\": %s", json_quote_str (ctx_quote, g_mime_certificate_get_fingerprint (certificate)));
+	    /* these dates are seconds since the epoch; should we
+	     * provide a more human-readable format string? */
+	    time_t created = g_mime_signature_get_created (signature);
+	    if (created != -1)
+		printf (", \"created\": %d", (int) created);
+	    time_t expires = g_mime_signature_get_expires (signature);
+	    if (expires > 0)
+		printf (", \"expires\": %d", (int) expires);
+	    /* output user id only if validity is FULL or ULTIMATE. */
+	    /* note that gmime is using the term "trust" here, which
+	     * is WRONG.  It's actually user id "validity". */
+	    if (certificate) {
+		const char *name = g_mime_certificate_get_name (certificate);
+		GMimeCertificateTrust trust = g_mime_certificate_get_trust (certificate);
+		if (name && (trust == GMIME_CERTIFICATE_TRUST_FULLY || trust == GMIME_CERTIFICATE_TRUST_ULTIMATE))
+		    printf (", \"userid\": %s", json_quote_str (ctx_quote, name));
+	    }
+	} else if (certificate) {
+	    const char *key_id = g_mime_certificate_get_key_id (certificate);
+	    if (key_id)
+		printf (", \"keyid\": %s", json_quote_str (ctx_quote, key_id));
+	}
+
+	GMimeSignatureError errors = g_mime_signature_get_errors (signature);
+	if (errors != GMIME_SIGNATURE_ERROR_NONE) {
+	    printf (", \"errors\": %d", errors);
+	}
+
+	printf ("}");
+     }
+
+    printf ("]");
+
+    talloc_free (ctx_quote);
+}
+#else
 static void
 format_part_sigstatus_json (const GMimeSignatureValidity* validity)
 {
@@ -652,6 +739,7 @@ format_part_sigstatus_json (const GMimeSignatureValidity* validity)
 
     talloc_free (ctx_quote);
 }
+#endif
 
 static void
 format_part_content_json (GMimeObject *part)
@@ -1000,13 +1088,20 @@ notmuch_show_command (void *ctx, unused (int argc), unused (char *argv[]))
 	} else if ((STRNCMP_LITERAL (argv[i], "--verify") == 0) ||
 		   (STRNCMP_LITERAL (argv[i], "--decrypt") == 0)) {
 	    if (params.cryptoctx == NULL) {
+#ifdef GMIME_ATLEAST_26
+		/* TODO: GMimePasswordRequestFunc */
+		if (NULL == (params.cryptoctx = g_mime_gpg_context_new(NULL, "gpg")))
+#else
 		GMimeSession* session = g_object_new(g_mime_session_get_type(), NULL);
 		if (NULL == (params.cryptoctx = g_mime_gpg_context_new(session, "gpg")))
+#endif
 		    fprintf (stderr, "Failed to construct gpg context.\n");
 		else
 		    g_mime_gpg_context_set_always_trust((GMimeGpgContext*)params.cryptoctx, FALSE);
+#ifndef GMIME_ATLEAST_26
 		g_object_unref (session);
 		session = NULL;
+#endif
 	    }
 	    if (STRNCMP_LITERAL (argv[i], "--decrypt") == 0)
 		params.decrypt = 1;

show-message.c

@@ -48,7 +48,11 @@ show_message_part (mime_node_t *node,
 	format->part_encstatus (node->decrypt_success);
 
     if (node->verify_attempted && format->part_sigstatus)
+#ifdef GMIME_ATLEAST_26
+	format->part_sigstatus (node->sig_list);
+#else
 	format->part_sigstatus (node->sig_validity);
+#endif
 
     format->part_content (part);
 

test/crypto

@@ -104,6 +104,8 @@ test_expect_equal \
     "$expected"
 
 test_begin_subtest "signature verification with signer key unavailable"
+# this is broken with current versions of gmime-2.6
+(ldd $(which notmuch) | grep -Fq gmime-2.6) && test_subtest_known_broken
 # move the gnupghome temporarily out of the way
 mv "${GNUPGHOME}"{,.bak}
 output=$(notmuch show --format=json --verify subject:"test signed message 001" \