feat: custom label shorthands

.github/FUNDING.yml

@@ -1,3 +0,0 @@
-# These are supported funding model platforms
-
-github: traefik

.github/ISSUE_TEMPLATE.md

@@ -1,77 +0,0 @@
-<!-- PLEASE FOLLOW THE ISSUE TEMPLATE TO HELP TRIAGE AND SUPPORT! -->
-
-### Do you want to request a *feature* or report a *bug*?
-
-<!--
-DO NOT FILE ISSUES FOR GENERAL SUPPORT QUESTIONS.
-
-The issue tracker is for reporting bugs and feature requests only.
-For end-user related support questions, please refer to one of the following:
-
-- the Traefik community forum: https://community.traefik.io/
-
--->
-
-Bug
-
-<!--
-
-The configurations between 1.X and 2.X are NOT compatible.
-Please have a look here https://doc.traefik.io/traefik/getting-started/configuration-overview/.
-
--->
-
-### What did you do?
-
-<!--
-
-HOW TO WRITE A GOOD BUG REPORT?
-
-- Respect the issue template as much as possible.
-- The title should be short and descriptive.
-- Explain the conditions which led you to report this issue: the context.
-- The context should lead to something, an idea or a problem that you’re facing.
-- Remain clear and concise.
-- Format your messages to help the reader focus on what matters and understand the structure of your message, use Markdown syntax https://help.github.com/articles/github-flavored-markdown
-
--->
-
-### What did you expect to see?
-
-
-
-### What did you see instead?
-
-
-
-### Output of `traefik version`: (_What version of Traefik are you using?_)
-
-<!--
-`latest` is not considered as a valid version.
-
-For the Traefik Docker image:
-    docker run [IMAGE] version
-    ex: docker run traefik version
-
--->
-
-```
-(paste your output here)
-```
-
-### What is your environment & configuration (arguments, toml, provider, platform, ...)?
-
-```toml
-# (paste your configuration here)
-```
-
-<!--
-Add more configuration information here.
--->
-
-
-### If applicable, please paste the log output in DEBUG level (`--log.level=DEBUG` switch)
-
-```
-(paste your output here)
-```

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,82 +0,0 @@
-name: Bug Report (Traefik)
-description: Create a report to help us improve.
-body:
-  - type: checkboxes
-    id: terms
-    attributes:
-      label: Welcome!
-      description: |
-        The issue tracker is for reporting bugs and feature requests only.
-        For end-user related support questions, please use the [Traefik community forum](https://community.traefik.io/).
-
-        All new/updated issues are triaged regularly by the maintainers.
-        All issues closed by a bot are subsequently double-checked by the maintainers.
-
-        DO NOT FILE ISSUES FOR GENERAL SUPPORT QUESTIONS.
-
-      options:
-        - label: Yes, I've searched similar issues on [GitHub](https://github.com/traefik/traefik/issues) and didn't find any.
-          required: true
-        - label: Yes, I've searched similar issues on the [Traefik community forum](https://community.traefik.io) and didn't find any.
-          required: true
-
-  - type: textarea
-    attributes:
-      label: What did you do?
-      description: |
-        How to write a good bug report?
-
-        - Respect the issue template as much as possible.
-        - The title should be short and descriptive.
-        - Explain the conditions which led you to report this issue: the context.
-        - The context should lead to something, an idea or a problem that you’re facing.
-        - Remain clear and concise.
-        - Format your messages to help the reader focus on what matters and understand the structure of your message, use [Markdown syntax](https://help.github.com/articles/github-flavored-markdown)
-      placeholder: What did you do?
-    validations:
-      required: true
-
-  - type: textarea
-    attributes:
-      label: What did you see instead?
-      placeholder: What did you see instead?
-    validations:
-      required: true
-
-  - type: textarea
-    attributes:
-      label: What version of Traefik are you using?
-      description: |
-        `latest` is not considered as a valid version.
-
-        Output of `traefik version`.
-
-        For the Traefik Docker image (`docker run [IMAGE] version`), example:
-        ```console
-        $ docker run traefik version
-        ```
-      placeholder: Paste your output here.
-    validations:
-      required: true
-
-  - type: textarea
-    attributes:
-      label: What is your environment & configuration?
-      description: arguments, toml, provider, platform, ...
-      placeholder: Add information here.
-      value: |
-        ```yaml
-        # (paste your configuration here)
-        ```
-
-        Add more configuration information here.
-    validations:
-      required: true
-
-  - type: textarea
-    attributes:
-      label: If applicable, please paste the log output in DEBUG level
-      description: "`--log.level=DEBUG` switch."
-      placeholder: Paste your output here.
-    validations:
-      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +0,0 @@
-blank_issues_enabled: false
-contact_links:
-  - name: Traefik Community Support
-    url: https://community.traefik.io/
-    about: If you have a question, or are looking for advice, please post on our Discuss forum! The community loves to chime in to help. Happy Coding!
-  - name: Traefik Helm Chart Issues
-    url: https://github.com/traefik/traefik-helm-chart
-    about: Are you submitting an issue or feature enhancement for the Traefik helm chart? Please post in the traefik-helm-chart GitHub Issues.

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -1,33 +0,0 @@
-name: Feature Request (Traefik)
-description: Suggest an idea for this project.
-body:
-  - type: checkboxes
-    id: terms
-    attributes:
-      label: Welcome!
-      description: |
-        The issue tracker is for reporting bugs and feature requests only. For end-user related support questions, please refer to one of the following:
-        - the Traefik community forum: https://community.traefik.io/
-
-        DO NOT FILE ISSUES FOR GENERAL SUPPORT QUESTIONS.
-      options:
-        - label: Yes, I've searched similar issues on [GitHub](https://github.com/traefik/traefik/issues) and didn't find any.
-          required: true
-        - label: Yes, I've searched similar issues on the [Traefik community forum](https://community.traefik.io) and didn't find any.
-          required: true
-
-  - type: textarea
-    attributes:
-      label: What did you expect to see?
-      description: |
-        How to write a good issue?
-
-        - Respect the issue template as much as possible.
-        - The title should be short and descriptive.
-        - Explain the conditions which led you to report this issue: the context.
-        - The context should lead to something, an idea or a problem that you’re facing.
-        - Remain clear and concise.
-        - Format your messages to help the reader focus on what matters and understand the structure of your message, use [Markdown syntax](https://help.github.com/articles/github-flavored-markdown)
-      placeholder: What did you expect to see?
-    validations:
-      required: true

.github/PULL_REQUEST_TEMPLATE/mergeback.md

@@ -1,7 +0,0 @@
-### What does this PR do?
-
-Merge v{{.Version}} into master
-
-### Motivation
-
-Be sync.

.github/PULL_REQUEST_TEMPLATE/release.md

@@ -1,7 +0,0 @@
-### What does this PR do?
-
-Prepare release v{{.Version}}.
-
-### Motivation
-
-Create a new release.

.github/workflows/sync-docker-images.yaml

@@ -1,26 +0,0 @@
-name: Sync Docker Images
-
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 0 * * *" # Run every day
-
-jobs:
-  sync:
-    runs-on: ubuntu-latest
-    permissions:
-      packages: write
-      contents: read
-    if: github.repository == 'traefik/traefik'
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: imjasonh/setup-crane@v0.4
-      
-      - name: Sync
-        run: |
-          EXCLUDED_TAGS="1.7.9-alpine v1.0.0-beta.392 v1.0.0-beta.404 v1.0.0-beta.704 v1.0.0-rc1 v1.7.9-alpine"
-          EXCLUDED_REGEX=$(echo $EXCLUDED_TAGS | sed 's/ /|/g')
-          diff <(crane ls traefik) <(crane ls ghcr.io/traefik/traefik) | grep '^<' | awk '{print $2}' | while read -r tag; do [[ "$tag" =~ ^($EXCLUDED_REGEX)$ ]] || (echo "Processing image: traefik:$tag"; crane cp "traefik:$tag" "ghcr.io/traefik/traefik:$tag"); done
-          crane cp traefik:latest ghcr.io/traefik/traefik:latest

Dockerfile

@@ -5,6 +5,7 @@ RUN apk add --no-cache --no-progress ca-certificates tzdata
 
 ARG TARGETPLATFORM
 COPY ./dist/$TARGETPLATFORM/traefik /
+COPY ./traefik.yml /etc/traefik/traefik.yml
 
 EXPOSE 80
 VOLUME ["/tmp"]

README.md

@@ -1,3 +1,7 @@
+# My modified version of Traefik
+slightly modified version of traefik, will be rebased on the latest tag from time to time  
+this version includes callbacks to external services on configuration update and custom docker label mappings  
+feel free to check out last 2 commits, they are like 100sloc together  
 
 <p align="center">
     <picture>

cmd/traefik/traefik.go

@@ -49,6 +49,7 @@ import (
 	"github.com/traefik/traefik/v3/pkg/tcp"
 	traefiktls "github.com/traefik/traefik/v3/pkg/tls"
 	"github.com/traefik/traefik/v3/pkg/version"
+	"github.com/traefik/traefik/v3/pkg/updater"
 )
 
 func main() {
@@ -199,6 +200,8 @@ func setupServer(staticConfiguration *static.Configuration) (*server.Server, err
 
 	tsProviders := initTailscaleProviders(staticConfiguration, providerAggregator)
 
+	updaterProvider := updater.New(staticConfiguration);
+
 	// Observability
 
 	metricRegistries := registerMetricClients(staticConfiguration.Metrics)
@@ -388,6 +391,9 @@ func setupServer(staticConfiguration *static.Configuration) (*server.Server, err
 		}
 	})
 
+	// Updater
+	watcher.AddListener(updaterProvider.HandleConfigUpdate)
+
 	return server.NewServer(routinesPool, serverEntryPointsTCP, serverEntryPointsUDP, watcher, observabilityMgr), nil
 }
 

docs/content/reference/install-configuration/configuration-options.md

@@ -137,6 +137,7 @@ THIS FILE MUST NOT BE EDITED BY HAND
 | <a id="opt-experimental-plugins-name-version" href="#opt-experimental-plugins-name-version" title="#opt-experimental-plugins-name-version">experimental.plugins._name_.version</a> | plugin's version. | |
 | <a id="opt-global-checknewversion" href="#opt-global-checknewversion" title="#opt-global-checknewversion">global.checknewversion</a> | Periodically check if a new version has been released. | true |
 | <a id="opt-global-sendanonymoususage" href="#opt-global-sendanonymoususage" title="#opt-global-sendanonymoususage">global.sendanonymoususage</a> | Periodically send anonymous usage statistics. If the option is not specified, it will be disabled by default. | false |
+| <a id="opt-global-updatercallbacks" href="#opt-global-updatercallbacks" title="#opt-global-updatercallbacks">global.updatercallbacks</a> | Callback urls for updater script (example: https://localhost:8080/callback) | |
 | <a id="opt-hostresolver" href="#opt-hostresolver" title="#opt-hostresolver">hostresolver</a> | Enable CNAME Flattening. | false |
 | <a id="opt-hostresolver-cnameflattening" href="#opt-hostresolver-cnameflattening" title="#opt-hostresolver-cnameflattening">hostresolver.cnameflattening</a> | A flag to enable/disable CNAME flattening | false |
 | <a id="opt-hostresolver-resolvconfig" href="#opt-hostresolver-resolvconfig" title="#opt-hostresolver-resolvconfig">hostresolver.resolvconfig</a> | resolv.conf used for DNS resolving | /etc/resolv.conf |
@@ -272,6 +273,10 @@ THIS FILE MUST NOT BE EDITED BY HAND
 | <a id="opt-providers-docker-endpoint" href="#opt-providers-docker-endpoint" title="#opt-providers-docker-endpoint">providers.docker.endpoint</a> | Docker server endpoint. Can be a TCP or a Unix socket endpoint. | unix:///var/run/docker.sock |
 | <a id="opt-providers-docker-exposedbydefault" href="#opt-providers-docker-exposedbydefault" title="#opt-providers-docker-exposedbydefault">providers.docker.exposedbydefault</a> | Expose containers by default. | true |
 | <a id="opt-providers-docker-httpclienttimeout" href="#opt-providers-docker-httpclienttimeout" title="#opt-providers-docker-httpclienttimeout">providers.docker.httpclienttimeout</a> | Client timeout for HTTP connections. | 0 |
+| <a id="opt-providers-docker-labelmap" href="#opt-providers-docker-labelmap" title="#opt-providers-docker-labelmap">providers.docker.labelmap</a> | Label shorthands. | |
+| <a id="opt-providers-docker-labelmap0-from" href="#opt-providers-docker-labelmap0-from" title="#opt-providers-docker-labelmap0-from">providers.docker.labelmap[0].from</a> | Shorthand label. | |
+| <a id="opt-providers-docker-labelmap0-to" href="#opt-providers-docker-labelmap0-to" title="#opt-providers-docker-labelmap0-to">providers.docker.labelmap[0].to</a> | Full label with templates. | |
+| <a id="opt-providers-docker-labelmap0-value" href="#opt-providers-docker-labelmap0-value" title="#opt-providers-docker-labelmap0-value">providers.docker.labelmap[0].value</a> | Optional override; used instead of user input if set. | |
 | <a id="opt-providers-docker-network" href="#opt-providers-docker-network" title="#opt-providers-docker-network">providers.docker.network</a> | Default Docker network used. | |
 | <a id="opt-providers-docker-password" href="#opt-providers-docker-password" title="#opt-providers-docker-password">providers.docker.password</a> | Password for Basic HTTP authentication. | |
 | <a id="opt-providers-docker-tls-ca" href="#opt-providers-docker-tls-ca" title="#opt-providers-docker-tls-ca">providers.docker.tls.ca</a> | TLS CA | |
@@ -421,6 +426,10 @@ THIS FILE MUST NOT BE EDITED BY HAND
 | <a id="opt-providers-swarm-endpoint" href="#opt-providers-swarm-endpoint" title="#opt-providers-swarm-endpoint">providers.swarm.endpoint</a> | Docker server endpoint. Can be a TCP or a Unix socket endpoint. | unix:///var/run/docker.sock |
 | <a id="opt-providers-swarm-exposedbydefault" href="#opt-providers-swarm-exposedbydefault" title="#opt-providers-swarm-exposedbydefault">providers.swarm.exposedbydefault</a> | Expose containers by default. | true |
 | <a id="opt-providers-swarm-httpclienttimeout" href="#opt-providers-swarm-httpclienttimeout" title="#opt-providers-swarm-httpclienttimeout">providers.swarm.httpclienttimeout</a> | Client timeout for HTTP connections. | 0 |
+| <a id="opt-providers-swarm-labelmap" href="#opt-providers-swarm-labelmap" title="#opt-providers-swarm-labelmap">providers.swarm.labelmap</a> | Label shorthands. | |
+| <a id="opt-providers-swarm-labelmap0-from" href="#opt-providers-swarm-labelmap0-from" title="#opt-providers-swarm-labelmap0-from">providers.swarm.labelmap[0].from</a> | Shorthand label. | |
+| <a id="opt-providers-swarm-labelmap0-to" href="#opt-providers-swarm-labelmap0-to" title="#opt-providers-swarm-labelmap0-to">providers.swarm.labelmap[0].to</a> | Full label with templates. | |
+| <a id="opt-providers-swarm-labelmap0-value" href="#opt-providers-swarm-labelmap0-value" title="#opt-providers-swarm-labelmap0-value">providers.swarm.labelmap[0].value</a> | Optional override; used instead of user input if set. | |
 | <a id="opt-providers-swarm-network" href="#opt-providers-swarm-network" title="#opt-providers-swarm-network">providers.swarm.network</a> | Default Docker network used. | |
 | <a id="opt-providers-swarm-password" href="#opt-providers-swarm-password" title="#opt-providers-swarm-password">providers.swarm.password</a> | Password for Basic HTTP authentication. | |
 | <a id="opt-providers-swarm-refreshseconds" href="#opt-providers-swarm-refreshseconds" title="#opt-providers-swarm-refreshseconds">providers.swarm.refreshseconds</a> | Polling interval for swarm mode. | 15 |

docs/content/reference/static-configuration/cli-ref.md

@@ -390,6 +390,9 @@ Periodically check if a new version has been released. (Default: ```true```)
 `--global.sendanonymoususage`:  
 Periodically send anonymous usage statistics. If the option is not specified, it will be disabled by default. (Default: ```false```)
 
+`--global.updatercallbacks`:  
+Callback urls for updater script (example: https://localhost:8080/callback)
+
 `--hostresolver`:  
 Enable CNAME Flattening. (Default: ```false```)
 
@@ -795,6 +798,18 @@ Expose containers by default. (Default: ```true```)
 `--providers.docker.httpclienttimeout`:  
 Client timeout for HTTP connections. (Default: ```0```)
 
+`--providers.docker.labelmap`:  
+Label shorthands.
+
+`--providers.docker.labelmap[n].from`:  
+Shorthand label.
+
+`--providers.docker.labelmap[n].to`:  
+Full label with templates.
+
+`--providers.docker.labelmap[n].value`:  
+Optional override; used instead of user input if set.
+
 `--providers.docker.network`:  
 Default Docker network used.
 
@@ -1242,6 +1257,18 @@ Expose containers by default. (Default: ```true```)
 `--providers.swarm.httpclienttimeout`:  
 Client timeout for HTTP connections. (Default: ```0```)
 
+`--providers.swarm.labelmap`:  
+Label shorthands.
+
+`--providers.swarm.labelmap[n].from`:  
+Shorthand label.
+
+`--providers.swarm.labelmap[n].to`:  
+Full label with templates.
+
+`--providers.swarm.labelmap[n].value`:  
+Optional override; used instead of user input if set.
+
 `--providers.swarm.network`:  
 Default Docker network used.
 

docs/content/reference/static-configuration/env-ref.md

@@ -390,6 +390,9 @@ Periodically check if a new version has been released. (Default: ```true```)
 `TRAEFIK_GLOBAL_SENDANONYMOUSUSAGE`:  
 Periodically send anonymous usage statistics. If the option is not specified, it will be disabled by default. (Default: ```false```)
 
+`TRAEFIK_GLOBAL_UPDATERCALLBACKS`:  
+Callback urls for updater script (example: https://localhost:8080/callback)
+
 `TRAEFIK_HOSTRESOLVER`:  
 Enable CNAME Flattening. (Default: ```false```)
 
@@ -795,6 +798,18 @@ Expose containers by default. (Default: ```true```)
 `TRAEFIK_PROVIDERS_DOCKER_HTTPCLIENTTIMEOUT`:  
 Client timeout for HTTP connections. (Default: ```0```)
 
+`TRAEFIK_PROVIDERS_DOCKER_LABELMAP`:  
+Label shorthands.
+
+`TRAEFIK_PROVIDERS_DOCKER_LABELMAP_n_FROM`:  
+Shorthand label.
+
+`TRAEFIK_PROVIDERS_DOCKER_LABELMAP_n_TO`:  
+Full label with templates.
+
+`TRAEFIK_PROVIDERS_DOCKER_LABELMAP_n_VALUE`:  
+Optional override; used instead of user input if set.
+
 `TRAEFIK_PROVIDERS_DOCKER_NETWORK`:  
 Default Docker network used.
 
@@ -1242,6 +1257,18 @@ Expose containers by default. (Default: ```true```)
 `TRAEFIK_PROVIDERS_SWARM_HTTPCLIENTTIMEOUT`:  
 Client timeout for HTTP connections. (Default: ```0```)
 
+`TRAEFIK_PROVIDERS_SWARM_LABELMAP`:  
+Label shorthands.
+
+`TRAEFIK_PROVIDERS_SWARM_LABELMAP_n_FROM`:  
+Shorthand label.
+
+`TRAEFIK_PROVIDERS_SWARM_LABELMAP_n_TO`:  
+Full label with templates.
+
+`TRAEFIK_PROVIDERS_SWARM_LABELMAP_n_VALUE`:  
+Optional override; used instead of user input if set.
+
 `TRAEFIK_PROVIDERS_SWARM_NETWORK`:  
 Default Docker network used.
 

docs/content/reference/static-configuration/file.toml

@@ -3,6 +3,7 @@
 [global]
   checkNewVersion = true
   sendAnonymousUsage = true
+  updaterCallbacks = ["foobar", "foobar"]
 
 [serversTransport]
   insecureSkipVerify = true
@@ -98,6 +99,16 @@
     password = "foobar"
     endpoint = "foobar"
     httpClientTimeout = "42s"
+
+    [[providers.docker.labelMap]]
+      from = "foobar"
+      to = "foobar"
+      value = "foobar"
+
+    [[providers.docker.labelMap]]
+      from = "foobar"
+      to = "foobar"
+      value = "foobar"
     [providers.docker.tls]
       ca = "foobar"
       cert = "foobar"
@@ -116,6 +127,16 @@
     endpoint = "foobar"
     httpClientTimeout = "42s"
     refreshSeconds = "42s"
+
+    [[providers.swarm.labelMap]]
+      from = "foobar"
+      to = "foobar"
+      value = "foobar"
+
+    [[providers.swarm.labelMap]]
+      from = "foobar"
+      to = "foobar"
+      value = "foobar"
     [providers.swarm.tls]
       ca = "foobar"
       cert = "foobar"

docs/content/reference/static-configuration/file.yaml

@@ -3,6 +3,9 @@
 global:
   checkNewVersion: true
   sendAnonymousUsage: true
+  updaterCallbacks:
+    - foobar
+    - foobar
 serversTransport:
   insecureSkipVerify: true
   rootCAs:
@@ -107,6 +110,13 @@ providers:
     useBindPortIP: true
     watch: true
     defaultRule: foobar
+    labelMap:
+      - from: foobar
+        to: foobar
+        value: foobar
+      - from: foobar
+        to: foobar
+        value: foobar
     username: foobar
     password: foobar
     endpoint: foobar
@@ -124,6 +134,13 @@ providers:
     useBindPortIP: true
     watch: true
     defaultRule: foobar
+    labelMap:
+      - from: foobar
+        to: foobar
+        value: foobar
+      - from: foobar
+        to: foobar
+        value: foobar
     username: foobar
     password: foobar
     endpoint: foobar

pkg/config/static/static_config.go

@@ -113,6 +113,7 @@ type CertificateResolver struct {
 type Global struct {
 	CheckNewVersion    bool `description:"Periodically check if a new version has been released." json:"checkNewVersion,omitempty" toml:"checkNewVersion,omitempty" yaml:"checkNewVersion,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	SendAnonymousUsage bool `description:"Periodically send anonymous usage statistics. If the option is not specified, it will be disabled by default." json:"sendAnonymousUsage,omitempty" toml:"sendAnonymousUsage,omitempty" yaml:"sendAnonymousUsage,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
+	UpdaterCallbacks   []string `description:"Callback urls for updater script (example: https://localhost:8080/callback)" json:"updaterCallbacks,omitempty" toml:"updaterCallbacks,omitempty" yaml:"updaterCallbacks,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 }
 
 // ServersTransport options to configure communication between Traefik and the servers.

pkg/provider/configuration.go

@@ -396,8 +396,8 @@ func AddStore(configuration *dynamic.TLSConfiguration, storeName string, store t
 	return reflect.DeepEqual(configuration.Stores[storeName], store)
 }
 
-// MakeDefaultRuleTemplate creates the default rule template.
+// MakeAnyTemplate creates a template with any name
-func MakeDefaultRuleTemplate(defaultRule string, funcMap template.FuncMap) (*template.Template, error) {
+func MakeAnyTemplate(name string, value string, funcMap template.FuncMap) (*template.Template, error) {
 	defaultFuncMap := sprig.TxtFuncMap()
 	defaultFuncMap["normalize"] = Normalize
 
@@ -405,7 +405,12 @@ func MakeDefaultRuleTemplate(defaultRule string, funcMap template.FuncMap) (*tem
 		defaultFuncMap[k] = fn
 	}
 
-	return template.New("defaultRule").Funcs(defaultFuncMap).Parse(defaultRule)
+	return template.New(name).Funcs(defaultFuncMap).Parse(value)
+}
+
+// MakeDefaultRuleTemplate creates the default rule template.
+func MakeDefaultRuleTemplate(defaultRule string, funcMap template.FuncMap) (*template.Template, error) {
+	return MakeAnyTemplate("defaultRule", defaultRule, funcMap)
 }
 
 // BuildTCPRouterConfiguration builds a router configuration.

pkg/provider/docker/config.go

@@ -1,6 +1,7 @@
 package docker
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -28,15 +29,50 @@ func NewDynConfBuilder(configuration Shared, apiClient client.APIClient, swarm b
 	return &DynConfBuilder{Shared: configuration, apiClient: apiClient, swarm: swarm}
 }
 
+func (p *DynConfBuilder) applyLabels(container *dockerData, model interface{}) {
+	for _, item := range p.LabelMap {
+		value, ok := container.Labels[item.From]
+		if !ok { // label doesn't exist
+			continue
+		}
+
+		writer := &bytes.Buffer{}
+		if err := item.toTpl.Execute(writer, model); err != nil {
+			continue // should never happen?
+		}
+
+		to := writer.String()
+		if item.Value != nil {
+			container.Labels[to] = *item.Value
+		} else {
+			container.Labels[to] = value
+		}
+	}
+}
+
 func (p *DynConfBuilder) build(ctx context.Context, containersInspected []dockerData) *dynamic.Configuration {
 	configurations := make(map[string]*dynamic.Configuration)
 
 	for _, container := range containersInspected {
+		serviceName := getServiceName(container)
+
+		model := struct {
+			Name          string
+			ContainerName string
+			Labels        *map[string]string
+		}{
+			Name:          serviceName,
+			ContainerName: strings.TrimPrefix(container.Name, "/"),
+			Labels:        &container.Labels,
+		}
+
 		containerName := getServiceName(container) + "-" + container.ID
 
 		logger := log.Ctx(ctx).With().Str("container", containerName).Logger()
 		ctxContainer := logger.WithContext(ctx)
 
+		p.applyLabels(&container, model)
+
 		if !p.keepContainer(ctxContainer, container) {
 			continue
 		}
@@ -83,18 +119,6 @@ func (p *DynConfBuilder) build(ctx context.Context, containersInspected []docker
 			continue
 		}
 
-		serviceName := getServiceName(container)
-
-		model := struct {
-			Name          string
-			ContainerName string
-			Labels        map[string]string
-		}{
-			Name:          serviceName,
-			ContainerName: strings.TrimPrefix(container.Name, "/"),
-			Labels:        container.Labels,
-		}
-
 		provider.BuildRouterConfiguration(ctx, confFromLabel.HTTP, serviceName, p.defaultRuleTpl, model)
 
 		configurations[containerName] = confFromLabel

pkg/provider/docker/pdocker.go

@@ -48,8 +48,15 @@ func (p *Provider) Init() error {
 	if err != nil {
 		return fmt.Errorf("error while parsing default rule: %w", err)
 	}
-
 	p.defaultRuleTpl = defaultRuleTpl
+
+	for _, item := range p.LabelMap {
+		toTpl, err := provider.MakeAnyTemplate(item.From, item.To, nil)
+		if err != nil {
+			return fmt.Errorf("error while parsing label %v: %w", item.To, err)
+		}
+		item.toTpl = toTpl
+	}
 	return nil
 }
 

pkg/provider/docker/shared.go

@@ -33,9 +33,19 @@ type Shared struct {
 	Watch       bool   `description:"Watch Docker events." json:"watch,omitempty" toml:"watch,omitempty" yaml:"watch,omitempty" export:"true"`
 	DefaultRule string `description:"Default rule." json:"defaultRule,omitempty" toml:"defaultRule,omitempty" yaml:"defaultRule,omitempty"`
 
+	LabelMap []*LabelMapItem `description:"Label shorthands." json:"labelMap,omitempty" toml:"labelMap,omitempty" yaml:"labelMap,omitempty"`
+
 	defaultRuleTpl *template.Template
 }
 
+type LabelMapItem struct {
+	From string `description:"Shorthand label." json:"from,omitempty" toml:"from,omitempty" yaml:"from,omitempty"`
+	To string `description:"Full label with templates." json:"to,omitempty" toml:"to,omitempty" yaml:"to,omitempty"`
+	Value *string `description:"Optional override; used instead of user input if set." json:"value,omitempty" toml:"value,omitempty" yaml:"value,omitempty"`
+	toTpl *template.Template
+}
+
+
 func inspectContainers(ctx context.Context, dockerClient client.ContainerAPIClient, containerID string) dockerData {
 	containerInspected, err := dockerClient.ContainerInspect(ctx, containerID)
 	if err != nil {

pkg/updater/provider.go

@@ -0,0 +1,49 @@
+package updater
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+
+	"github.com/rs/zerolog/log"
+	"github.com/traefik/traefik/v3/pkg/config/dynamic"
+	"github.com/traefik/traefik/v3/pkg/config/static"
+	"github.com/traefik/traefik/v3/pkg/safe"
+)
+
+type Updater struct {
+	callbackUrls []string
+}
+
+func New(config *static.Configuration) *Updater {
+	updater := &Updater{
+		callbackUrls: config.Global.UpdaterCallbacks,
+	}
+
+	return updater
+}
+
+func (u *Updater) HandleConfigUpdate(cfg dynamic.Configuration) {
+	body, err := json.Marshal(cfg)
+
+	if err != nil {
+		// should never happen?
+		log.Error().Err(err).Msg("Error while marshalling dynamic configuration data to json")
+		return
+	}
+
+	requestBody := bytes.NewBuffer(body)
+
+	for _, url := range u.callbackUrls {
+		safe.Go(func() {
+			resp, err := http.Post(url, "application/json", requestBody)
+
+			if err != nil {
+				log.Error().Err(err).Str("url", url).Msg("Error while sending configuration data to callback")
+			} else  {
+				log.Debug().Str("url", url).Msg("Configuration data sent")
+				resp.Body.Close()
+			}
+		})
+	}
+}