forgejo/modules/setting/config_env.go
Earl Warren e2e7a72f80
[BRANDING] parse FORGEJO__* in the container environment
Add the FORGEJO__ prefix as equivalent to GITEA__ when interpreted by
environment-to-ini. It is used when running the Forgejo container like
so:

  docker run --name forgejo -e FORGEJO__security__INSTALL_LOCK=true \
             -d codeberg.org/forgejo/forgejo:1.19

(cherry picked from commit 6cd61e2ab7)
(cherry picked from commit 62cae8cc6a)
(cherry picked from commit aee1afc509)
(cherry picked from commit 6ba563cd9b)
(cherry picked from commit 6429b20f4a)
(cherry picked from commit dd545aa077)
(cherry picked from commit 63a00e573e)
(cherry picked from commit 8e35a50b91)
(cherry picked from commit 26e8fb6cd9)
(cherry picked from commit 56bbf644be)
(cherry picked from commit 4d0a8c8640)
(cherry picked from commit b58f775fa2)
(cherry picked from commit f4b6fa7a93)
(cherry picked from commit 4eca363082)
2023-05-30 11:00:37 +02:00

145 lines
4.1 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"os"
"regexp"
"strconv"
"strings"
"code.gitea.io/gitea/modules/log"
"gopkg.in/ini.v1"
)
const escapeRegexpString = "_0[xX](([0-9a-fA-F][0-9a-fA-F])+)_"
var escapeRegex = regexp.MustCompile(escapeRegexpString)
// 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 = section != "" && 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 *ini.File, prefixGitea, suffixFile string, envs []string) (changed bool) {
prefixRegexp := regexp.MustCompile(prefixGitea)
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, suffixFile, 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
}
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
}