Add new config options for fts_solr

..to avoid adding _all_ headers to solr index (limit_mime_hdr) and to disable adding field names to solr index (skip_mime_hdr_fieldname)

Credits to:
* Matthias Schaff <[email protected]>
* Nikolaus Zirwes <[email protected]>

Author: arnisoph

src/plugins/fts-solr/fts-backend-solr.c

@@ -510,21 +510,39 @@ fts_backend_solr_update_set_build_key(struct fts_backend_update_context *_ctx,
 {
 	struct solr_fts_backend_update_context *ctx =
 		(struct solr_fts_backend_update_context *)_ctx;
+	struct solr_fts_backend *backend = (struct solr_fts_backend *)ctx->ctx.backend;
+	struct fts_solr_user *fuser = FTS_SOLR_USER_CONTEXT(backend->backend.ns->user);
 
 	if (key->uid != ctx->prev_uid)
 		fts_backend_solr_uid_changed(ctx, key->uid);
 
-	switch (key->type) {
-	case FTS_BACKEND_BUILD_KEY_HDR:
+	bool want_indexed = FALSE;
+	bool want_hdr = TRUE;
+	if (key->type == FTS_BACKEND_BUILD_KEY_HDR || key->type == FTS_BACKEND_BUILD_KEY_MIME_HDR) {
 		if (fts_header_want_indexed(key->hdr_name)) {
-			ctx->cur_value2 =
-				fts_solr_field_get(ctx, key->hdr_name);
+			want_indexed = TRUE;
+		} else if (fuser->set.limit_mime_hdr) {
+			want_hdr = FALSE;
+		}
+
+		if (!want_indexed && !want_hdr) {
+			return FALSE;
 		}
+	}
+
+	switch (key->type) {
+	case FTS_BACKEND_BUILD_KEY_HDR:
+		if (want_indexed)
+		    ctx->cur_value2 = fts_solr_field_get(ctx, key->hdr_name);
 		/* fall through */
 	case FTS_BACKEND_BUILD_KEY_MIME_HDR:
 		ctx->cur_value = fts_solr_field_get(ctx, "hdr");
-		xml_encode(ctx->cur_value, key->hdr_name);
-		str_append(ctx->cur_value, ": ");
+		if (want_hdr) {
+			if(!fuser->set.skip_mime_hdr_fieldname) {
+				xml_encode(ctx->cur_value, key->hdr_name);
+				str_append(ctx->cur_value, ": ");
+			}
+		}
 		break;
 	case FTS_BACKEND_BUILD_KEY_BODY_PART:
 		if (!ctx->body_open) {
@@ -843,7 +861,7 @@ fts_backend_solr_lookup(struct fts_backend *_backend, struct mailbox *box,
 		if (solr_search(_backend, str, box_guid,
 				&result->maybe_uids, &result->scores) < 0)
 			return -1;
-	}               
+	}
 	result->scores_sorted = TRUE;
 	return 0;
 }

src/plugins/fts-solr/fts-solr-plugin.c

@@ -37,6 +37,10 @@ fts_solr_plugin_init_settings(struct mail_user *user,
 		} else if (strcmp(*tmp, "default_ns=") == 0) {
 			set->default_ns_prefix =
 				p_strdup(user->pool, *tmp + 11);
+		} else if (strcmp(*tmp, "limit_mime_hdr") == 0) {
+			set->limit_mime_hdr = TRUE;
+		} else if (strcmp(*tmp, "skip_mime_hdr_fieldname") == 0) {
+			set->skip_mime_hdr_fieldname = TRUE;
 		} else {
 			i_error("fts_solr: Invalid setting: %s", *tmp);
 			return -1;

src/plugins/fts-solr/fts-solr-plugin.h

@@ -12,6 +12,8 @@ struct fts_solr_settings {
 	const char *url, *default_ns_prefix;
 	bool use_libfts;
 	bool debug;
+	bool limit_mime_hdr;
+	bool skip_mime_hdr_fieldname;
 };
 
 struct fts_solr_user {