diff options
Diffstat (limited to 'modules/caddyhttp/push/link.go')
-rw-r--r-- | modules/caddyhttp/push/link.go | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/modules/caddyhttp/push/link.go b/modules/caddyhttp/push/link.go new file mode 100644 index 0000000..16b0e7d --- /dev/null +++ b/modules/caddyhttp/push/link.go @@ -0,0 +1,78 @@ +// Copyright 2015 Matthew Holt and The Caddy Authors +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package push + +import ( + "strings" +) + +// linkResource contains the results of a parsed Link header. +type linkResource struct { + uri string + params map[string]string +} + +// parseLinkHeader is responsible for parsing Link header +// and returning list of found resources. +// +// Accepted formats are: +// +// Link: <resource>; as=script +// Link: <resource>; as=script,<resource>; as=style +// Link: <resource>;<resource2> +// +// where <resource> begins with a forward slash (/). +func parseLinkHeader(header string) []linkResource { + resources := []linkResource{} + + if header == "" { + return resources + } + + for _, link := range strings.Split(header, comma) { + l := linkResource{params: make(map[string]string)} + + li, ri := strings.Index(link, "<"), strings.Index(link, ">") + if li == -1 || ri == -1 { + continue + } + + l.uri = strings.TrimSpace(link[li+1 : ri]) + + for _, param := range strings.Split(strings.TrimSpace(link[ri+1:]), semicolon) { + parts := strings.SplitN(strings.TrimSpace(param), equal, 2) + key := strings.TrimSpace(parts[0]) + if key == "" { + continue + } + if len(parts) == 1 { + l.params[key] = key + } + if len(parts) == 2 { + l.params[key] = strings.TrimSpace(parts[1]) + } + } + + resources = append(resources, l) + } + + return resources +} + +const ( + comma = "," + semicolon = ";" + equal = "=" +) |