forgejo/modules/setting/config_env.go
Earl Warren 7d60a6f511
[BRANDING] parse FORGEJO__* in the container environment
(cherry picked from commit b075991747)
(cherry picked from commit da3f76228e)
(cherry picked from commit 20d196e74f)
(cherry picked from commit 0bf8b1824e)
(cherry picked from commit 655bb770a7)
(cherry picked from commit d69d5c2c46)
(cherry picked from commit 00b55e5a53)
(cherry picked from commit 456121fd8a)
(cherry picked from commit 9716a158e4)
2023-09-11 17:59:19 +02:00

170 lines
4.6 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"bytes"
"os"
"regexp"
"strconv"
"strings"
"code.gitea.io/gitea/modules/log"
)
const (
EnvConfigKeyPrefixGitea = "^(FORGEJO|GITEA)__"
EnvConfigKeySuffixFile = "__FILE"
)
const escapeRegexpString = "_0[xX](([0-9a-fA-F][0-9a-fA-F])+)_"
var escapeRegex = regexp.MustCompile(escapeRegexpString)
func CollectEnvConfigKeys() (keys []string) {
for _, env := range os.Environ() {
if strings.HasPrefix(env, EnvConfigKeyPrefixGitea) {
k, _, _ := strings.Cut(env, "=")
keys = append(keys, k)
}
}
return keys
}
func ClearEnvConfigKeys() {
for _, k := range CollectEnvConfigKeys() {
_ = os.Unsetenv(k)
}
}
// decodeEnvSectionKey will decode a portable string encoded Section__Key pair
// Portable strings are considered to be of the form [A-Z0-9_]*
// We will encode a disallowed value as the UTF8 byte string preceded by _0X and
// followed by _. E.g. _0X2C_ for a '-' and _0X2E_ for '.'
// Section and Key are separated by a plain '__'.
// The entire section can be encoded as a UTF8 byte string
func decodeEnvSectionKey(encoded string) (ok bool, section, key string) {
inKey := false
last := 0
escapeStringIndices := escapeRegex.FindAllStringIndex(encoded, -1)
for _, unescapeIdx := range escapeStringIndices {
preceding := encoded[last:unescapeIdx[0]]
if !inKey {
if splitter := strings.Index(preceding, "__"); splitter > -1 {
section += preceding[:splitter]
inKey = true
key += preceding[splitter+2:]
} else {
section += preceding
}
} else {
key += preceding
}
toDecode := encoded[unescapeIdx[0]+3 : unescapeIdx[1]-1]
decodedBytes := make([]byte, len(toDecode)/2)
for i := 0; i < len(toDecode)/2; i++ {
// Can ignore error here as we know these should be hexadecimal from the regexp
byteInt, _ := strconv.ParseInt(toDecode[2*i:2*i+2], 16, 0)
decodedBytes[i] = byte(byteInt)
}
if inKey {
key += string(decodedBytes)
} else {
section += string(decodedBytes)
}
last = unescapeIdx[1]
}
remaining := encoded[last:]
if !inKey {
if splitter := strings.Index(remaining, "__"); splitter > -1 {
section += remaining[:splitter]
key += remaining[splitter+2:]
} else {
section += remaining
}
} else {
key += remaining
}
section = strings.ToLower(section)
ok = key != ""
if !ok {
section = ""
key = ""
}
return ok, section, key
}
// decodeEnvironmentKey decode the environment key to section and key
// The environment key is in the form of GITEA__SECTION__KEY or GITEA__SECTION__KEY__FILE
func decodeEnvironmentKey(prefixRegexp *regexp.Regexp, suffixFile, envKey string) (ok bool, section, key string, useFileValue bool) {
if strings.HasSuffix(envKey, suffixFile) {
useFileValue = true
envKey = envKey[:len(envKey)-len(suffixFile)]
}
loc := prefixRegexp.FindStringIndex(envKey)
if loc == nil {
return false, "", "", false
}
ok, section, key = decodeEnvSectionKey(envKey[loc[1]:])
return ok, section, key, useFileValue
}
func EnvironmentToConfig(cfg ConfigProvider, envs []string) (changed bool) {
prefixRegexp := regexp.MustCompile(EnvConfigKeyPrefixGitea)
for _, kv := range envs {
idx := strings.IndexByte(kv, '=')
if idx < 0 {
continue
}
// parse the environment variable to config section name and key name
envKey := kv[:idx]
envValue := kv[idx+1:]
ok, sectionName, keyName, useFileValue := decodeEnvironmentKey(prefixRegexp, EnvConfigKeySuffixFile, envKey)
if !ok {
continue
}
// use environment value as config value, or read the file content as value if the key indicates a file
keyValue := envValue
if useFileValue {
fileContent, err := os.ReadFile(envValue)
if err != nil {
log.Error("Error reading file for %s : %v", envKey, envValue, err)
continue
}
if bytes.HasSuffix(fileContent, []byte("\r\n")) {
fileContent = fileContent[:len(fileContent)-2]
} else if bytes.HasSuffix(fileContent, []byte("\n")) {
fileContent = fileContent[:len(fileContent)-1]
}
keyValue = string(fileContent)
}
// try to set the config value if necessary
section, err := cfg.GetSection(sectionName)
if err != nil {
section, err = cfg.NewSection(sectionName)
if err != nil {
log.Error("Error creating section: %s : %v", sectionName, err)
continue
}
}
key := section.Key(keyName)
if key == nil {
key, err = section.NewKey(keyName, keyValue)
if err != nil {
log.Error("Error creating key: %s in section: %s with value: %s : %v", keyName, sectionName, keyValue, err)
continue
}
}
oldValue := key.Value()
if !changed && oldValue != keyValue {
changed = true
}
key.SetValue(keyValue)
}
return changed
}