fix: strip spaces and newlines from the comment before matching

We are now stripping spaces and newlines from the beginning and the end to make
sure that the regex matches correctly. The ^ will match the beginning of the
comment and $ will match the end of the comment without newlines or space.

Signed-off-by: Chmouel Boudjnah <[email protected]>

Author: chmouel

docs/content/docs/guide/gitops_commands.md

@@ -104,9 +104,9 @@ grep "string" /tmp/comment
 
 ## Custom GitOps Commands
 
-Using the [on-comment]({{< relref "/docs/guide/matchingevents.md#matching-a-pipelinerun-on-a-regexp-in-a-comment" >}}) annotation on your `PipelineRun`, you can define custom GitOps commands that will be triggered by comments on the Pull Request.
+Using the [on-comment]({{< relref "/docs/guide/matchingevents.md#matching-a-pipelinerun-on-a-regex-in-a-comment" >}}) annotation on your `PipelineRun`, you can define custom GitOps commands that will be triggered by comments on the Pull Request.
 
-See the [on-comment]({{< relref "/docs/guide/matchingevents.md#matching-a-pipelinerun-on-a-regexp-in-a-comment" >}}) guide for more detailed information.
+See the [on-comment]({{< relref "/docs/guide/matchingevents.md#matching-a-pipelinerun-on-a-regex-in-a-comment" >}}) guide for more detailed information.
 
 For a complete example, you can see how Pipelines-as-Code's own repo implemented some prow comments via the `on-comment` annotation:
 

docs/content/docs/guide/matchingevents.md

@@ -175,18 +175,26 @@ and you have a `Pull Request` changing the files `.tekton/pipelinerun.yaml`,
 `on-path-change-ignore` annotation will ignore the `***.md` and `***.yaml`
 files.
 
-## Matching a PipelineRun on a Regexp in a comment
+## Matching a PipelineRun on a Regex in a comment
 
-{{< tech_preview "Matching PipelineRun on regexp in comments" >}}
+{{< tech_preview "Matching PipelineRun on regex in comments" >}}
 {{< support_matrix github_app="true" github_webhook="true" gitea="true" gitlab="true" bitbucket_cloud="false" bitbucket_server="false" >}}
 
-You can match a PipelineRun on a comment on a Pull Request or a [Pushed Commit]({{< relref "/docs/guide/running.md#gitops-commands-on-pushed-commits">}})
-with the annotation `pipelinesascode.tekton.dev/on-comment`.
+You can trigger a PipelineRun based on a comment on a Pull Request or a [Pushed
+Commit]({{< relref
+"/docs/guide/running.md#gitops-commands-on-pushed-commits">}}) using the
+annotation `pipelinesascode.tekton.dev/on-comment`.
 
-The comment is a regexp and if a newly created comment has this regexp it will
-automatically match the PipelineRun and start it.
+The comment is treated as a regular expression (regex). The spaces and newlines
+are stripped at the beginning or the end of the comment before matching so `^`
+will match the beginning of the comment and `$` will match the end of the
+comment without newlines or space.
 
-For example:
+If a new comment on a Pull Request matches the specified regex, the PipelineRun
+will be triggered and started. This only applies to newly created comments;
+updates or edits to existing comments will not trigger the PipelineRun.
+
+Example:
 
 ```yaml
 ---
@@ -198,23 +206,23 @@ metadata:
     pipelinesascode.tekton.dev/on-comment: "^/merge-pr"
 ```
 
-This will match the merge-pr `PipelineRun` when a comment on a pull request
+This will trigger the merge-pr PipelineRun when a comment on a pull request
 starts with `/merge-pr`.
 
-When the PipelineRun that has been triggered with the `on-comment` annotation
-gets started, the template variable `{{ trigger_comment }}` gets set. See the
-documentation [here]({{< relref "/docs/guide/gitops_commands.md#accessing-the-comment-triggering-the-pipelinerun" >}})
+When a PipelineRun is getting triggered by the `on-comment` annotation starts,
+the template variable {{ trigger_comment }} is set. For more details, refer to
+the [documentation]({{< relref
+"/docs/guide/gitops_commands.md#accessing-the-comment-triggering-the-pipelinerun"
+>}}).
 
-Note that the `on-comment` annotation will respect the `pull_request` [Policy]({{< relref "/docs/guide/policy" >}}) rule,
-so only users in the `pull_request` policy will be able to trigger the
-PipelineRun.
+Note that the on-comment annotation adheres to the pull_request [Policy]({{<
+relref "/docs/guide/policy" >}}) rule. Only users specified in the pull_request
+policy will be able to trigger the PipelineRun.
 
 {{< hint info >}}
-
-- The `on-comment` annotation is supported on `pull_request`. On  `push` events,
-it is only supported [when targeting the main branch without arguments]({{< relref
-"/docs/guide/gitops_commands.md#gitops-commands-on-pushed-commits" >}}).
-
+The on-comment annotation is supported for pull_request events. For push events,
+it is only supported [when targeting the main branch without arguments]({{<
+relref "/docs/guide/gitops_commands.md#gitops-commands-on-pushed-commits" >}}).
 {{< /hint >}}
 
 ## Matching PipelineRun to a Pull Request labels
@@ -304,7 +312,7 @@ You can find more information about the CEL language spec here:
 <https://github.com/google/cel-spec/blob/master/doc/langdef.md>
 {{< /hint >}}
 
-### Matching a PipelineRun to a branch with a regexp
+### Matching a PipelineRun to a branch with a regex
 
 In a CEL expression, you can match a field name using a regular expression. For
 example, if you want to trigger a `PipelineRun` for the`pull_request` event and

pkg/matcher/annotation_matcher.go

@@ -204,7 +204,10 @@ func MatchPipelinerunByAnnotation(ctx context.Context, logger *zap.SugaredLogger
 				logger.Warnf("could not compile regexp %s from pipelineRun %s", targetComment, prName)
 				continue
 			}
-			if re.MatchString(event.TriggerComment) {
+
+			strippedComment := strings.TrimSpace(
+				strings.TrimPrefix(strings.TrimSuffix(event.TriggerComment, "\r\n"), "\r\n"))
+			if re.MatchString(strippedComment) {
 				event.EventType = opscomments.OnCommentEventType.String()
 				logger.Infof("matched pipelinerun with name: %s on gitops comment: %q", prName, event.TriggerComment)
 				matchedPRs = append(matchedPRs, prMatch)

pkg/matcher/annotation_matcher_test.go

@@ -1520,7 +1520,7 @@ func TestMatchPipelinerunByAnnotation(t *testing.T) {
 		ObjectMeta: metav1.ObjectMeta{
 			Name: "pipeline-on-comment",
 			Annotations: map[string]string{
-				keys.OnComment: "^/hello-world",
+				keys.OnComment: "^/hello-world$",
 			},
 		},
 	}
@@ -1690,7 +1690,7 @@ func TestMatchPipelinerunByAnnotation(t *testing.T) {
 			args: args{
 				pruns: []*tektonv1.PipelineRun{pipelineGood, pipelineOnComment},
 				runevent: info.Event{
-					TriggerComment: "/hello-world",
+					TriggerComment: "   /hello-world   \r\n",
 					TriggerTarget:  "pull_request",
 					EventType:      opscomments.OnCommentEventType.String(),
 					BaseBranch:     "main",