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match.go
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match.go
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/*
Copyright The Helm 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 router
import (
"net/http"
"strings"
"github.com/gin-gonic/gin"
)
/*
In order to allow params at the top level using gin (e.g. /:repo/...), this lengthy method is
unfortunately necessary. For more info, please see the "panic: wildcard route" error described
here: https://github.com/gin-gonic/gin/issues/388
This also adds the ability to accept a ":repo" param in the route containing a slash ("/"), so
that routes can be reused for different levels of multitenancy.
For example, the route GET /:repo/index.yaml will be matched differently depending on value used for --depth:
--depth=0:
Path: "/index.yaml"
Repo: ""
--depth=1:
Path: "/myrepo/index.yaml"
Repo: "myrepo"
--depth=2:
Path: "/myorg/myrepo/index.yaml"
Repo: "myorg/myrepo"
--depth=3:
Path: "/myorg/myteam/myrepo/index.yaml"
Repo: "myorg/myteam/myrepo"
*/
func match(routes []*Route, method string, url string, contextPath string, depth int) (*Route, []gin.Param) {
var noRepoPathSplit []string
var repo, repoPath, noRepoPath string
var startIndex, numNoRepoPathParts int
var tryRepoRoutes bool
if contextPath != "" {
if url == contextPath {
url = "/"
} else if strings.HasPrefix(url, contextPath) {
url = strings.Replace(url, contextPath, "", 1)
} else {
return nil, nil
}
}
if url == "/health" && method == http.MethodGet {
for _, route := range routes {
if route.Path == "/health" {
return route, nil
}
}
}
isApiRoute := strings.HasPrefix(url, "/api")
if isApiRoute {
startIndex = 2
} else {
startIndex = 1
}
pathSplit := strings.Split(url, "/")
numParts := len(pathSplit)
if numParts >= depth+startIndex {
repoParts := pathSplit[startIndex : depth+startIndex]
if len(repoParts) == depth {
tryRepoRoutes = true
repo = strings.Join(repoParts, "/")
noRepoPath = "/" + strings.Join(pathSplit[depth+startIndex:], "/")
repoPath = "/:repo" + noRepoPath
if isApiRoute {
repoPath = "/api" + repoPath
noRepoPath = "/api" + noRepoPath
}
noRepoPathSplit = strings.Split(noRepoPath, "/")
numNoRepoPathParts = len(noRepoPathSplit)
}
}
for _, route := range routes {
if route.Method != method {
continue
}
if route.Path == url {
return route, nil
} else if tryRepoRoutes {
if route.Path == repoPath {
return route, []gin.Param{{"repo", repo}}
} else {
p := strings.Replace(route.Path, "/:repo", "", 1)
if routeSplit := strings.Split(p, "/"); len(routeSplit) == numNoRepoPathParts {
isMatch := true
var params []gin.Param
for i, part := range routeSplit {
if paramSplit := strings.Split(part, ":"); len(paramSplit) > 1 {
params = append(params, gin.Param{Key: paramSplit[1], Value: noRepoPathSplit[i]})
} else if routeSplit[i] != noRepoPathSplit[i] {
isMatch = false
break
}
}
if isMatch {
params = append(params, gin.Param{Key: "repo", Value: repo})
return route, params
}
}
}
}
}
return nil, nil
}