Store a target's settings as columns (closes #543)

A target's settings move from the per-type JSON string in
targets.config to columns: url, headers, timeout_seconds,
forward_query, archive_expiry and archive_rotation. A column a type
does not use stays empty. headers holds the header map as JSON text
through GORM's JSON serializer, and archive_expiry holds a
time.Duration, 0 meaning never. The forms check each setting once,
with the same refusals and messages, and the edit form is filled from
the columns, so the per-type config structs, their parsers and the
"could not be read" branches are gone. A delivery task carries the
six settings in place of the JSON string; tests check that each copy
into a task, and back out of one, keeps all six.

Model: opus-5-5

internal/delivery/target_headers_test.go

@@ -1,23 +1,21 @@
 package delivery_test
 
 import (
-	"encoding/json"
 	"strconv"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"sneak.berlin/go/webhooker/internal/database"
 	"sneak.berlin/go/webhooker/internal/delivery"
 )
 
-// Literals these tests repeat, named so that the header names and the
-// keep-forever archive config each have one definition.
+// Literals these tests repeat, named so that each header name has one
+// definition.
 const (
 	headerAuthorization = "Authorization"
 	headerContentType   = "Content-Type"
+	headerUserAgent     = "User-Agent"
 	bearerValue         = "Bearer abc"
-	archiveConfigNever  = "{\"expiry\":\"never\"}"
 )
 
 func TestParseTargetHeaders_AcceptsPairs(t *testing.T) {
@@ -41,23 +39,13 @@ func TestParseTargetHeaders_AcceptsPairs(t *testing.T) {
 	)
 }
 
-// A configuration with no headers must stay indistinguishable from
-// one written before the field existed, so omitempty drops the key.
+// An input of blank lines is no headers, not an error.
 func TestParseTargetHeaders_EmptyInputYieldsNoHeaders(t *testing.T) {
 	t.Parallel()
 
 	got, err := delivery.ParseTargetHeaders("\n  \n")
 	require.NoError(t, err)
 	assert.Empty(t, got)
-
-	encoded, err := json.Marshal(delivery.HTTPTargetConfig{
-		URL:     "https://example.com/h",
-		Headers: got,
-	})
-	require.NoError(t, err)
-	assert.JSONEq(
-		t, `{"url":"https://example.com/h"}`, string(encoded),
-	)
 }
 
 func TestParseTargetHeaders_Rejects(t *testing.T) {
@@ -181,89 +169,6 @@ func TestFormatTargetTimeout(t *testing.T) {
 	assert.Empty(t, delivery.FormatTargetTimeout(-1))
 }
 
-func TestNewTargetConfigForm(t *testing.T) {
-	t.Parallel()
-
-	form, err := delivery.NewTargetConfigForm(&database.Target{
-		Type: database.TargetTypeHTTP,
-		Config: `{"url":"https://example.com/h",` +
-			`"headers":{"Authorization":"Bearer abc"},` +
-			`"timeout":9}`,
-		MaxAttempts: 1,
-	})
-	require.NoError(t, err)
-	assert.Equal(t, "https://example.com/h", form.URL)
-	assert.Equal(t, "Authorization: Bearer abc\n", form.Headers)
-	assert.Equal(t, "9", form.Timeout)
-
-	form, err = delivery.NewTargetConfigForm(&database.Target{
-		Type:        database.TargetTypeSlack,
-		Config:      `{"webhookUrl":"https://hooks.example/s"}`,
-		MaxAttempts: 1,
-	})
-	require.NoError(t, err)
-	assert.Equal(t, "https://hooks.example/s", form.URL)
-
-	form, err = delivery.NewTargetConfigForm(&database.Target{
-		Type:   database.TargetTypeDatabase,
-		Config: `{"expiry":"720h","rotation":"daily"}`,
-	})
-	require.NoError(t, err)
-	assert.Equal(t, "720h", form.Expiry)
-	assert.Equal(t, rotationDaily, form.Rotation)
-
-	form, err = delivery.NewTargetConfigForm(&database.Target{
-		Type: database.TargetTypeLog,
-	})
-	require.NoError(t, err)
-	assert.Empty(t, form.URL)
-}
-
-// A keep-forever archive target yields an empty expiry, so the edit
-// form starts on never; saving it unchanged stores never, which means
-// the same as an empty expiry.
-func TestNewTargetConfigForm_DatabaseNeverIsBlank(t *testing.T) {
-	t.Parallel()
-
-	for _, cfg := range []string{"", `{}`, archiveConfigNever} {
-		form, err := delivery.NewTargetConfigForm(
-			&database.Target{
-				Type:   database.TargetTypeDatabase,
-				Config: cfg,
-			},
-		)
-		require.NoError(t, err, cfg)
-		assert.Empty(t, form.Expiry, cfg)
-	}
-}
-
-// An unreadable stored config is an error rather than a blank form
-// that looks like a target with no settings, so the caller can tell
-// the operator that saving replaces the stored value.
-func TestNewTargetConfigForm_UnreadableConfigErrors(t *testing.T) {
-	t.Parallel()
-
-	cases := []*database.Target{
-		{Type: database.TargetTypeHTTP, Config: "not json", MaxAttempts: 1},
-		{Type: database.TargetTypeHTTP, Config: `{}`, MaxAttempts: 1},
-		{Type: database.TargetTypeSlack, Config: "", MaxAttempts: 1},
-		{
-			Type:   database.TargetTypeDatabase,
-			Config: `{"expiry":"soon"}`,
-		},
-		{
-			Type:   database.TargetTypeDatabase,
-			Config: weeklyConfig,
-		},
-		{Type: database.TargetType("nope")},
-	}
-
-	for _, target := range cases {
-		_, err := delivery.NewTargetConfigForm(target)
-		require.Error(t, err, target.Type)
-	}
-}
-
 // The ceiling exists so one misconfigured target cannot hold a
 // delivery worker indefinitely, and it is inclusive.
 func TestParseTargetTimeout_CeilingIsInclusive(t *testing.T) {