coder · Emyrk · Apr 4, 2023 · Apr 4, 2023
diff --git a/coderd/httpapi/queryparams.go b/coderd/httpapi/queryparams.go
@@ -24,12 +24,16 @@ type QueryParamParser struct {
 	// Parsed is a map of all query params that were parsed. This is useful
 	// for checking if extra query params were passed in.
 	Parsed map[string]bool
+	// RequiredParams is a map of all query params that are required. This is useful
+	// for forcing a value to be provided.
+	RequiredParams map[string]bool
 }
 
 func NewQueryParamParser() *QueryParamParser {
 	return &QueryParamParser{
-		Errors: []codersdk.ValidationError{},
-		Parsed: map[string]bool{},
+		Errors:         []codersdk.ValidationError{},
+		Parsed:         map[string]bool{},
+		RequiredParams: map[string]bool{},
 	}
 }
 
@@ -51,6 +55,20 @@ func (p *QueryParamParser) addParsed(key string) {
 	p.Parsed[key] = true
 }
 
+func (p *QueryParamParser) UInt(vals url.Values, def uint64, queryParam string) uint64 {
+	v, err := parseQueryParam(p, vals, func(v string) (uint64, error) {
+		return strconv.ParseUint(v, 10, 64)
+	}, def, queryParam)
+	if err != nil {
+		p.Errors = append(p.Errors, codersdk.ValidationError{
+			Field:  queryParam,
+			Detail: fmt.Sprintf("Query param %q must be a valid positive integer (%s)", queryParam, err.Error()),
+		})
+		return 0
+	}
+	return v
+}
+
 func (p *QueryParamParser) Int(vals url.Values, def int, queryParam string) int {
 	v, err := parseQueryParam(p, vals, strconv.Atoi, def, queryParam)
 	if err != nil {
@@ -62,6 +80,11 @@ func (p *QueryParamParser) Int(vals url.Values, def int, queryParam string) int
 	return v
 }
 
+func (p *QueryParamParser) Required(queryParam string) *QueryParamParser {
+	p.RequiredParams[queryParam] = true
+	return p
+}
+
 func (p *QueryParamParser) UUIDorMe(vals url.Values, def uuid.UUID, me uuid.UUID, queryParam string) uuid.UUID {
 	return ParseCustom(p, vals, def, queryParam, func(v string) (uuid.UUID, error) {
 		if v == "me" {
@@ -178,6 +201,16 @@ func ParseCustomList[T any](parser *QueryParamParser, vals url.Values, def []T,
 
 func parseQueryParam[T any](parser *QueryParamParser, vals url.Values, parse func(v string) (T, error), def T, queryParam string) (T, error) {
 	parser.addParsed(queryParam)
+	// If the query param is required and not present, return an error.
+	if parser.RequiredParams[queryParam] && (!vals.Has(queryParam)) {
+		parser.Errors = append(parser.Errors, codersdk.ValidationError{
+			Field:  queryParam,
+			Detail: fmt.Sprintf("Query param %q is required", queryParam),
+		})
+		return def, nil
+	}
+
+	// If the query param is not present, return the default value.
 	if !vals.Has(queryParam) || vals.Get(queryParam) == "" {
 		return def, nil
 	}

diff --git a/coderd/httpapi/queryparams_test.go b/coderd/httpapi/queryparams_test.go
@@ -195,6 +195,43 @@ func TestParseQueryParams(t *testing.T) {
 		testQueryParams(t, expParams, parser, parser.Int)
 	})
 
+	t.Run("UInt", func(t *testing.T) {
+		t.Parallel()
+		expParams := []queryParamTestCase[uint64]{
+			{
+				QueryParam: "valid_integer",
+				Value:      "100",
+				Expected:   100,
+			},
+			{
+				QueryParam: "empty",
+				Value:      "",
+				Expected:   0,
+			},
+			{
+				QueryParam: "no_value",
+				NoSet:      true,
+				Default:    5,
+				Expected:   5,
+			},
+			{
+				QueryParam:            "negative",
+				Value:                 "-10",
+				Default:               5,
+				ExpectedErrorContains: "must be a valid positive integer",
+			},
+			{
+				QueryParam:            "invalid_integer",
+				Value:                 "bogus",
+				Expected:              0,
+				ExpectedErrorContains: "must be a valid positive integer",
+			},
+		}
+
+		parser := httpapi.NewQueryParamParser()
+		testQueryParams(t, expParams, parser, parser.UInt)
+	})
+
 	t.Run("UUIDs", func(t *testing.T) {
 		t.Parallel()
 		expParams := []queryParamTestCase[[]uuid.UUID]{
@@ -237,6 +274,15 @@ func TestParseQueryParams(t *testing.T) {
 		parser := httpapi.NewQueryParamParser()
 		testQueryParams(t, expParams, parser, parser.UUIDs)
 	})
+
+	t.Run("Required", func(t *testing.T) {
+		t.Parallel()
+
+		parser := httpapi.NewQueryParamParser()
+		parser.Required("test_value")
+		parser.UUID(url.Values{}, uuid.New(), "test_value")
+		require.Len(t, parser.Errors, 1)
+	})
 }
 
 func testQueryParams[T any](t *testing.T, testCases []queryParamTestCase[T], parser *httpapi.QueryParamParser, parse func(vals url.Values, def T, queryParam string) T) {