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action_query.go
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/
action_query.go
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// Copyright (c) 2019 The BFE 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 action
import (
"fmt"
"net/url"
"strings"
)
import (
"github.com/bfenetworks/bfe/bfe_basic"
)
// queryParse parses request query.
func queryParse(req *bfe_basic.Request) url.Values {
// re-use req.Query
if req.Query == nil {
req.Query = req.HttpRequest.URL.Query()
}
return req.Query
}
// queryDump dumps queries to string, e.g., key1=value1&key2=value2.
func queryDump(queries url.Values) string {
strs := make([]string, 0)
for key, values := range queries {
for _, value := range values {
str := fmt.Sprintf("%s=%s", key, value)
strs = append(strs, str)
}
}
return strings.Join(strs, "&")
}
// ReqQueryAdd adds some number of (key, value) to query.
func ReqQueryAdd(req *bfe_basic.Request, params []string) {
var addQueryString string
// parse the query
queries := queryParse(req)
// get number of pairs
pairNum := len(params) / 2
// add (key, value) to queries
for i := 0; i < pairNum; i++ {
key := params[2*i]
value := params[2*i+1]
// try to get value of given key
oldValue := queries.Get(key)
if oldValue == "" {
// key not exist, use Set()
queries.Set(key, value)
} else {
// key exist, use Add()
queries.Add(key, value)
}
addQueryString = addQueryString + "&" + key + "=" + value
}
// add rawQuery directly
if req.HttpRequest.URL.RawQuery == "" {
// if RawQuery is empty, remove prefix "&"
req.HttpRequest.URL.RawQuery = addQueryString[1:]
} else {
req.HttpRequest.URL.RawQuery += addQueryString
}
}
// ReqQueryRename renames query key from old name to new name.
func ReqQueryRename(req *bfe_basic.Request, oldName string, newName string) {
var values []string
var ok bool
// add prefix "&" to simplify process
rawQuery := "&" + req.HttpRequest.URL.RawQuery
// parse the query
queries := queryParse(req)
// renanme query key from old name to new name
if values, ok = queries[oldName]; !ok {
// not find
return
}
queries.Del(oldName)
queries[newName] = values
// rename keys
srcKey := "&" + oldName + "="
dstKey := "&" + newName + "="
rawQuery = strings.Replace(rawQuery, srcKey, dstKey, -1)
// remove prefix "&"
req.HttpRequest.URL.RawQuery = rawQuery[1:]
}
// ReqQueryDel deletes some keys from query
func ReqQueryDel(req *bfe_basic.Request, keys []string) {
// add "&" prefix and suffix to simplify process
rawQuery := "&" + req.HttpRequest.URL.RawQuery + "&"
// parse the query
queries := queryParse(req)
// delete some keys from queries
for _, key := range keys {
queries.Del(key)
for {
// find key start &key=
start := strings.Index(rawQuery, "&"+key+"=")
if start == -1 {
break
}
// find value end
end := strings.Index(rawQuery[start+1:], "&")
if end == -1 {
break
}
// remove start:start+end part
rawQuery = rawQuery[:start] + rawQuery[start+end+1:]
}
}
// set rawQuery, remove "&" prefix and suffix
if len(rawQuery) == 1 {
req.HttpRequest.URL.RawQuery = ""
} else {
req.HttpRequest.URL.RawQuery = rawQuery[1 : len(rawQuery)-1]
}
}
// ReqQueryDelAllExcept deletes all keys from query, except some keys
func ReqQueryDelAllExcept(req *bfe_basic.Request, keys []string) {
// add "&" prefix and suffix to simplify process
rawQuery := "&" + req.HttpRequest.URL.RawQuery + "&"
// parse the query
queries := queryParse(req)
// prepare map for keys
keysMap := make(map[string]bool)
for _, key := range keys {
keysMap[key] = true
}
// delete some keys from queries, except keys in keysMap
for key := range queries {
if _, ok := keysMap[key]; ok {
continue
}
queries.Del(key)
for {
// find key start
start := strings.Index(rawQuery, "&"+key+"=")
if start == -1 {
break
}
// find value end
end := strings.Index(rawQuery[start+1:], "&")
if end == -1 {
break
}
// remove start:start+end part
rawQuery = rawQuery[:start] + rawQuery[start+end+1:]
}
}
// set rawQuery, remove "&" prefix and suffix
if len(rawQuery) == 1 {
req.HttpRequest.URL.RawQuery = ""
} else {
req.HttpRequest.URL.RawQuery = rawQuery[1 : len(rawQuery)-1]
}
}