| 1 | // SPDX-License-Identifier: AGPL-3.0-or-later |
| 2 | |
| 3 | package concurrency |
| 4 | |
| 5 | import ( |
| 6 | "fmt" |
| 7 | "strings" |
| 8 | |
| 9 | "github.com/tenseleyFlow/shithub/internal/actions/expr" |
| 10 | ) |
| 11 | |
| 12 | // EvalContext is the limited trigger-time expression context for a |
| 13 | // concurrency.group value. It deliberately excludes secrets. |
| 14 | type EvalContext struct { |
| 15 | EventPayload map[string]any |
| 16 | HeadSHA string |
| 17 | HeadRef string |
| 18 | } |
| 19 | |
| 20 | // ResolveGroup evaluates `${{ ... }}` fragments in a concurrency group value. |
| 21 | // Literal text outside expressions is preserved. |
| 22 | func ResolveGroup(raw string, in EvalContext) (string, error) { |
| 23 | ctx := expr.Context{ |
| 24 | Shithub: expr.ShithubContext{ |
| 25 | Event: in.EventPayload, |
| 26 | SHA: in.HeadSHA, |
| 27 | Ref: in.HeadRef, |
| 28 | }, |
| 29 | Untrusted: expr.DefaultUntrusted(), |
| 30 | } |
| 31 | var out strings.Builder |
| 32 | if err := walkExpressions(raw, func(literal, body string) error { |
| 33 | if body == "" { |
| 34 | out.WriteString(literal) |
| 35 | return nil |
| 36 | } |
| 37 | out.WriteString(literal) |
| 38 | v, err := eval(body, &ctx) |
| 39 | if err != nil { |
| 40 | return err |
| 41 | } |
| 42 | out.WriteString(v.String()) |
| 43 | return nil |
| 44 | }); err != nil { |
| 45 | return "", fmt.Errorf("actions concurrency: resolve group: %w", err) |
| 46 | } |
| 47 | return validateGroup(out.String()) |
| 48 | } |
| 49 | |
| 50 | func eval(body string, ctx *expr.Context) (expr.Value, error) { |
| 51 | toks, err := expr.Lex(strings.TrimSpace(body)) |
| 52 | if err != nil { |
| 53 | return expr.Value{}, err |
| 54 | } |
| 55 | ast, err := expr.Parse(toks) |
| 56 | if err != nil { |
| 57 | return expr.Value{}, err |
| 58 | } |
| 59 | return expr.Eval(ast, ctx) |
| 60 | } |
| 61 | |
| 62 | func walkExpressions(raw string, fn func(literal, body string) error) error { |
| 63 | for { |
| 64 | start := strings.Index(raw, "${{") |
| 65 | if start < 0 { |
| 66 | return fn(raw, "") |
| 67 | } |
| 68 | end := strings.Index(raw[start+3:], "}}") |
| 69 | if end < 0 { |
| 70 | return fmt.Errorf("render expression: missing closing }}") |
| 71 | } |
| 72 | end += start + 3 |
| 73 | if err := fn(raw[:start], raw[start+3:end]); err != nil { |
| 74 | return err |
| 75 | } |
| 76 | raw = raw[end+2:] |
| 77 | } |
| 78 | } |
| 79 |