Repository: google/go-safeweb (go)

Issue:
Handling boolean form values
Currently, we consider valid booleans to be only  the strings `"true"` and `"false"`, unlike `strconv.ParseBool()` which correctly converts `"1", "t", "T", "true", "TRUE", "True", "0", "f", "F", "false", "FALSE", "False"` into `bool`. We should discuss the implications of this and decide whether we want to use `strconv.ParseBool()` in the `safehttp.Form` implementation.

Pull request description:
Changed to use strconv.ParseBool
Fixes #35

Patch:
diff --git a/safehttp/form.go b/safehttp/form.go
index d12dd5c..c67cb03 100644
--- a/safehttp/form.go
+++ b/safehttp/form.go
@@ -93,15 +93,12 @@ func (f *Form) Bool(param string, defaultValue bool) bool {
 	if !ok {
 		return defaultValue
 	}
-	switch vals[0] {
-	case "true":
-		return true
-	case "false":
-		return false
-	default:
-		f.err = fmt.Errorf("values of form parameter %q not a boolean", param)
+	paramVal, err := strconv.ParseBool(vals[0])
+	if err != nil {
+		f.err = err
+		return defaultValue
 	}
-	return defaultValue
+	return paramVal
 }
 
 func clearSlice(slicePtr interface{}) error {
@@ -177,16 +174,13 @@ func (f *Form) Slice(param string, slicePtr interface{}) {
 	case *[]bool:
 		res := make([]bool, 0, len(mapVals))
 		for _, x := range mapVals {
-			switch x {
-			case "true":
-				res = append(res, true)
-			case "false":
-				res = append(res, false)
-			default:
-				f.err = fmt.Errorf("values of form parameter %q not a boolean", param)
+			b, err := strconv.ParseBool(x)
+			if err != nil {
+				f.err = err
 				*values = nil
 				return
 			}
+			res = append(res, b)
 		}
 		*values = res
 	default:


Test patch:
diff --git a/safehttp/form_test.go b/safehttp/form_test.go
index 3cc8c9b..052e208 100644
--- a/safehttp/form_test.go
+++ b/safehttp/form_test.go
@@ -593,24 +593,34 @@ func TestFormValidBool(t *testing.T) {
 				reqs := []*http.Request{
 					httptest.NewRequest("POST", "/", strings.NewReader("pizza=true")),
 					httptest.NewRequest("POST", "/", strings.NewReader("pizza=false")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=True")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=False")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=TRUE")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=FALSE")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=t")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=f")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=T")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=F")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=1")),
+					httptest.NewRequest("POST", "/", strings.NewReader("pizza=0")),
 				}
 				for _, req := range reqs {
 					req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 				}
 				return reqs
 			}(),
-			want: []bool{true, false},
+			want: []bool{true, false, true, false, true, false, true, false, true, false, true, false},
 		},
 		{
 			name: "Valid booleans in POST multipart request",
 			reqs: func() []*http.Request {
-				slice := []bool{true, false}
+				slice := []string{"true", "false", "True", "False", "TRUE", "FALSE", "t", "f", "T", "F", "1", "0"}
 				var reqs []*http.Request
 				for _, val := range slice {
 					multipartReqBody := "--123\r\n" +
 						"Content-Disposition: form-data; name=\"pizza\"\r\n" +
 						"\r\n" +
-						fmt.Sprintf("%v\r\n", val) +
+						val + "\r\n" +
 						"--123--\r\n"
 					multipartReq := httptest.NewRequest("POST", "/", strings.NewReader(multipartReqBody))
 					multipartReq.Header.Set("Content-Type", `multipart/form-data; boundary="123"`)
@@ -619,7 +629,7 @@ func TestFormValidBool(t *testing.T) {
 				}
 				return reqs
 			}(),
-			want: []bool{true, false},
+			want: []bool{true, false, true, false, true, false, true, false, true, false, true, false},
 		},
 	}
 
@@ -740,6 +750,7 @@ func TestFormInvalidBool(t *testing.T) {
 }
 
 func TestFormValidSlice(t *testing.T) {
+	// TODO(@mihalimara22): Test other boolean syntax like "t", "f", "0" and "1" here.
 	validSlices := []interface{}{
 		[]int64{-8, 9, -100}, []uint64{8, 9, 10}, []string{"margeritta", "diavola", "calzone"}, []float64{1.3, 8.9, -4.1}, []bool{true, false, true},
 	}