PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 1 | // - |
| 2 | // ========================LICENSE_START================================= |
| 3 | // O-RAN-SC |
| 4 | // %% |
| 5 | // Copyright (C) 2022: Nordix Foundation |
| 6 | // %% |
| 7 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | // you may not use this file except in compliance with the License. |
| 9 | // You may obtain a copy of the License at |
| 10 | // |
| 11 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | // |
| 13 | // Unless required by applicable law or agreed to in writing, software |
| 14 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | // See the License for the specific language governing permissions and |
| 17 | // limitations under the License. |
| 18 | // ========================LICENSE_END=================================== |
| 19 | // |
| 20 | |
| 21 | package main |
| 22 | |
| 23 | import ( |
| 24 | "crypto/tls" |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 25 | "crypto/x509" |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 26 | "encoding/json" |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 27 | "io/ioutil" |
| 28 | "net/http" |
| 29 | "net/url" |
| 30 | "time" |
| 31 | |
| 32 | "os" |
| 33 | |
| 34 | log "github.com/sirupsen/logrus" |
| 35 | ) |
| 36 | |
| 37 | type JwtToken struct { |
| 38 | Access_token string |
| 39 | Expires_in int |
| 40 | Token_type string |
| 41 | } |
| 42 | |
| 43 | type Context struct { |
| 44 | Running bool |
| 45 | Config *Config |
| 46 | } |
| 47 | |
| 48 | func NewContext(config *Config) *Context { |
| 49 | return &Context{ |
| 50 | Running: true, |
| 51 | Config: config, |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | // @title Auth token fetcher |
elinuxhenrik | e46ddd4 | 2022-08-18 10:28:58 +0200 | [diff] [blame] | 56 | // @version 1.1.0 |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 57 | |
| 58 | // @license.name Apache 2.0 |
| 59 | // @license.url http://www.apache.org/licenses/LICENSE-2.0.html |
| 60 | |
| 61 | func main() { |
| 62 | configuration := NewConfig() |
| 63 | log.SetLevel(configuration.LogLevel) |
| 64 | |
| 65 | log.Debug("Using configuration: ", configuration) |
| 66 | start(NewContext(configuration)) |
| 67 | |
| 68 | keepAlive() |
| 69 | } |
| 70 | |
| 71 | func start(context *Context) { |
| 72 | log.Debug("Initializing") |
| 73 | if err := validateConfiguration(context.Config); err != nil { |
| 74 | log.Fatalf("Stopping due to error: %v", err) |
| 75 | } |
| 76 | |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 77 | cert := loadCertificate(context.Config.CertPath, context.Config.KeyPath) |
| 78 | caCerts := loadCaCerts(context.Config.CACertsPath) |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 79 | |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 80 | webClient := CreateHttpClient(cert, caCerts, 10*time.Second) |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 81 | |
| 82 | go periodicRefreshIwtToken(webClient, context) |
| 83 | } |
| 84 | |
| 85 | func periodicRefreshIwtToken(webClient *http.Client, context *Context) { |
| 86 | for context.Running { |
| 87 | jwtToken, err := fetchJwtToken(webClient, context.Config) |
| 88 | if check(err) { |
| 89 | saveAccessToken(jwtToken, context.Config) |
| 90 | } |
| 91 | delayTime := calcDelayTime(jwtToken, err, context.Config) |
| 92 | log.WithFields(log.Fields{"seconds": delayTime.Seconds()}).Debug("Sleeping") |
| 93 | time.Sleep(delayTime) |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | func calcDelayTime(token JwtToken, e error, confing *Config) time.Duration { |
| 98 | if e != nil { |
| 99 | return time.Second * 1 |
| 100 | } |
| 101 | remains := token.Expires_in - confing.RefreshMarginSeconds |
| 102 | if remains < 1 { |
| 103 | remains = 1 |
| 104 | } |
| 105 | return time.Second * time.Duration(remains) |
| 106 | } |
| 107 | |
| 108 | func check(e error) bool { |
| 109 | if e != nil { |
| 110 | log.Errorf("Failure reason: %v", e) |
| 111 | return false |
| 112 | } |
| 113 | return true |
| 114 | } |
| 115 | |
| 116 | func saveAccessToken(token JwtToken, configuration *Config) { |
| 117 | log.WithFields(log.Fields{"file": configuration.AuthTokenOutputFileName}).Debug("Saving access token") |
| 118 | data := []byte(token.Access_token) |
| 119 | err := os.WriteFile(configuration.AuthTokenOutputFileName, data, 0644) |
| 120 | check(err) |
| 121 | } |
| 122 | |
| 123 | func fetchJwtToken(webClient *http.Client, configuration *Config) (JwtToken, error) { |
| 124 | log.WithFields(log.Fields{"url": configuration.AuthServiceUrl}).Debug("Fetching token") |
| 125 | var jwt JwtToken |
| 126 | var err error |
| 127 | resp, err := webClient.PostForm(configuration.AuthServiceUrl, |
| 128 | url.Values{"client_secret": {configuration.ClientSecret}, "grant_type": {configuration.GrantType}, "client_id": {configuration.ClientId}}) |
| 129 | |
| 130 | if check(err) { |
| 131 | var body []byte |
| 132 | defer resp.Body.Close() |
| 133 | body, err = ioutil.ReadAll(resp.Body) |
| 134 | if check(err) { |
| 135 | err = json.Unmarshal([]byte(body), &jwt) |
| 136 | } |
| 137 | } |
| 138 | return jwt, err |
| 139 | } |
| 140 | |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 141 | func loadCertificate(certPath string, keyPath string) tls.Certificate { |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 142 | log.WithFields(log.Fields{"certPath": certPath, "keyPath": keyPath}).Debug("Loading cert") |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 143 | cert, err := tls.LoadX509KeyPair(certPath, keyPath) |
| 144 | if check(err) { |
| 145 | return cert |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 146 | } else { |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 147 | log.Fatalf("cannot create x509 keypair from cert file %s and key file %s due to: %v", certPath, keyPath, err) |
| 148 | return tls.Certificate{} |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 149 | } |
| 150 | } |
| 151 | |
PatrikBuhr | f4ad749 | 2022-03-23 08:15:21 +0100 | [diff] [blame] | 152 | func loadCaCerts(caCertsPath string) *x509.CertPool { |
| 153 | var err error |
| 154 | if caCertsPath == "" { |
| 155 | return nil |
| 156 | } |
| 157 | caCert, err := ioutil.ReadFile(caCertsPath) |
| 158 | check(err) |
| 159 | caCertPool := x509.NewCertPool() |
| 160 | caCertPool.AppendCertsFromPEM(caCert) |
| 161 | return caCertPool |
| 162 | } |
| 163 | |
PatrikBuhr | 07b2118 | 2022-03-10 16:07:56 +0100 | [diff] [blame] | 164 | func keepAlive() { |
| 165 | channel := make(chan int) |
| 166 | <-channel |
| 167 | } |