operations: add operations/hashsum to the rc as rclone hashsum equivalent

Fixes #7569

fs/operations/rc_test.go

@@ -2,6 +2,7 @@ package operations_test
 
 import (
 	"context"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -14,6 +15,7 @@ import (
 
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/cache"
+	"github.com/rclone/rclone/fs/hash"
 	"github.com/rclone/rclone/fs/operations"
 	"github.com/rclone/rclone/fs/rc"
 	"github.com/rclone/rclone/fstest"
@@ -779,3 +781,88 @@ deadbeefcafe00000000000000000000  subdir/file2
 	})
 
 }
+
+// operations/hashsum: hashsum a directory
+func TestRcHashsum(t *testing.T) {
+	ctx := context.Background()
+	r, call := rcNewRun(t, "operations/hashsum")
+	r.Mkdir(ctx, r.Fremote)
+
+	file1Contents := "file1 contents"
+	file1 := r.WriteBoth(ctx, "hashsum-file1", file1Contents, t1)
+	r.CheckLocalItems(t, file1)
+	r.CheckRemoteItems(t, file1)
+
+	hasher := hash.NewMultiHasher()
+	_, err := hasher.Write([]byte(file1Contents))
+	require.NoError(t, err)
+
+	for _, test := range []struct {
+		ht       hash.Type
+		base64   bool
+		download bool
+	}{
+		{
+			ht: r.Fremote.Hashes().GetOne(),
+		}, {
+			ht:     r.Fremote.Hashes().GetOne(),
+			base64: true,
+		}, {
+			ht:       hash.Whirlpool,
+			base64:   false,
+			download: true,
+		}, {
+			ht:       hash.Whirlpool,
+			base64:   true,
+			download: true,
+		},
+	} {
+		t.Run(fmt.Sprintf("hash=%v,base64=%v,download=%v", test.ht, test.base64, test.download), func(t *testing.T) {
+			file1Hash, err := hasher.SumString(test.ht, test.base64)
+			require.NoError(t, err)
+
+			in := rc.Params{
+				"fs":       r.FremoteName,
+				"hashType": test.ht.String(),
+				"base64":   test.base64,
+				"download": test.download,
+			}
+
+			out, err := call.Fn(ctx, in)
+			require.NoError(t, err)
+			assert.Equal(t, test.ht.String(), out["hashType"])
+			want := []string{
+				fmt.Sprintf("%s  hashsum-file1", file1Hash),
+			}
+			assert.Equal(t, want, out["hashsum"])
+		})
+	}
+}
+
+// operations/hashsum: hashsum a single file
+func TestRcHashsumFile(t *testing.T) {
+	ctx := context.Background()
+	r, call := rcNewRun(t, "operations/hashsum")
+	r.Mkdir(ctx, r.Fremote)
+
+	file1Contents := "file1 contents"
+	file1 := r.WriteBoth(ctx, "hashsum-file1", file1Contents, t1)
+	file2Contents := "file2 contents"
+	file2 := r.WriteBoth(ctx, "hashsum-file2", file2Contents, t1)
+	r.CheckLocalItems(t, file1, file2)
+	r.CheckRemoteItems(t, file1, file2)
+
+	// Make an fs pointing to just the file
+	fsString := path.Join(r.FremoteName, file1.Path)
+
+	in := rc.Params{
+		"fs":       fsString,
+		"hashType": "MD5",
+		"download": true,
+	}
+
+	out, err := call.Fn(ctx, in)
+	require.NoError(t, err)
+	assert.Equal(t, "md5", out["hashType"])
+	assert.Equal(t, []string{"0ef726ce9b1a7692357ff70dd321d595  hashsum-file1"}, out["hashsum"])
+}