feat(slack): truncate message

app/controlplane/plugins/core/slack-webhook/v1/slack_webhook.go

@@ -96,7 +96,9 @@ func (i *Integration) Execute(_ context.Context, req *sdk.ExecutionRequest) erro
 		return fmt.Errorf("running validation: %w", err)
 	}
 
-	summary, err := sdk.SummaryTable(req)
+	// 4000 is the max size of a Slack message
+	// if the message is larger than that, we will truncate it
+	summary, err := sdk.SummaryTable(req, sdk.WithMaxSize(4000))
 	if err != nil {
 		return fmt.Errorf("error summarizing the request: %w", err)
 	}

app/controlplane/plugins/sdk/v1/helpers.go

@@ -26,8 +26,8 @@ import (
 )
 
 type renderer struct {
-	render func(t table.Writer) string
-	format string
+	render  func(t table.Writer) string
+	maxSize int
 }
 
 type RenderOpt func(r *renderer) error
@@ -51,7 +51,13 @@ func WithFormat(format string) RenderOpt {
 			return fmt.Errorf("unsupported format %s", format)
 		}
 
-		r.format = format
+		return nil
+	}
+}
+
+func WithMaxSize(max int) RenderOpt {
+	return func(r *renderer) error {
+		r.maxSize = max
 		return nil
 	}
 }
@@ -60,7 +66,7 @@ func newRenderer(opts ...RenderOpt) (*renderer, error) {
 	r := &renderer{
 		render: func(t table.Writer) string {
 			return t.Render()
-		}, format: "text",
+		},
 	}
 
 	for _, opt := range opts {
@@ -182,11 +188,35 @@ func (r *renderer) summaryTable(m *ChainloopMetadata, predicate chainloop.Normal
 		result += "\n" + r.render(mt)
 	}
 
-	result += fmt.Sprintf("\n\nGet Full Attestation\n\n$ chainloop workflow run describe --id %s -o statement", wr.ID)
+	footer := fmt.Sprintf("\n\nGet Full Attestation\n\n$ chainloop workflow run describe --id %s -o statement", wr.ID)
+
+	// Truncate the text if it's too long to be displayed, the footer will be kept
+	if r.maxSize > 0 {
+		result = truncateText(result, r.maxSize-len(footer))
+	}
+
+	result += footer
 
 	return result, nil
 }
 
+// Truncate returns the first n runes of s.
+func truncateText(s string, n int) string {
+	truncatedPrefix := "... (truncated)"
+	n -= len(truncatedPrefix)
+
+	if len(s) <= n {
+		return s
+	}
+	for i := range s {
+		if n == 0 {
+			return s[:i] + truncatedPrefix
+		}
+		n--
+	}
+	return s
+}
+
 func SummaryTable(req *ExecutionRequest, opts ...RenderOpt) (string, error) {
 	renderer, err := newRenderer(opts...)
 	if err != nil {

app/controlplane/plugins/sdk/v1/helpers_test.go

@@ -41,6 +41,12 @@ func (s *helperTestSuite) TestSummaryTable() {
 			inputPath:  "testdata/attestations/full.json",
 			outputPath: "testdata/attestations/full.txt",
 		},
+		{
+			name:       "truncated text",
+			inputPath:  "testdata/attestations/full.json",
+			renderOpts: []RenderOpt{WithMaxSize(2000)},
+			outputPath: "testdata/attestations/truncated.txt",
+		},
 		{
 			name:       "full markdown",
 			inputPath:  "testdata/attestations/full.json",

app/controlplane/plugins/sdk/v1/testdata/attestations/truncated.txt

@@ -0,0 +1,37 @@
+┌─────────────────────────────────────┐
+│ Workflow                            │
+├──────────────┬──────────────────────┤
+│ ID           │ deadbeef             │
+│ Name         │ test-workflow        │
+│ Team         │ test-team            │
+│ Project      │ test-project         │
+├──────────────┼──────────────────────┤
+│ Workflow Run │                      │
+├──────────────┼──────────────────────┤
+│ ID           │ beefdead             │
+│ Started At   │ 22 Nov 21 00:00 UTC  │
+│ Finished At  │ 22 Nov 21 00:10 UTC  │
+│ State        │ success              │
+│ Runner Link  │ chainloop.dev/runner │
+│ Annotations  │ ------               │
+│              │ branch: stable       │
+│              │ toplevel: true       │
+└──────────────┴──────────────────────┘
+┌────────────────────────────────────────────────────────────────────────────────┐
+│ Materials                                                                      │
+├─────────────┬──────────────────────────────────────────────────────────────────┤
+│ Name        │ image                                                            │
+│ Type        │ CONTAINER_IMAGE                                                  │
+│ Value       │ index.docker.io/bitnami/nginx                                    │
+│ Digest      │ 264f55a6ff9cec2f4742a9faacc033b29f65c04dd4480e71e23579d484288d61 │
+├─────────────┼──────────────────────────────────────────────────────────────────┤
+│ Name        │ skynet-sbom                                                      │
+│ Type        │ SBOM_CYCLONEDX_JSON                                              │
+│ Value       │ sbom.cyclonedx.json                                              │
+│ Digest      │ 16159bb881eb4ab7eb5d8afc5350b0feeed1e31c0a268e355e74f9ccbe885e0c │
+│ Annotations │ ------                                                           │
+│             │ component: nginx                              ... (truncated)
+
+Get Full Attestation
+
+$ chainloop workflow run describe --id beefdead -o statement