Add staticcheck tool

vendor/honnef.co/go/tools/staticcheck/sa1007/sa1007.go

@@ -0,0 +1,43 @@
+package sa1007
+
+import (
+	"fmt"
+	"go/constant"
+	"net/url"
+
+	"honnef.co/go/tools/analysis/callcheck"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/internal/passes/buildir"
+	"honnef.co/go/tools/knowledge"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "SA1007",
+		Requires: []*analysis.Analyzer{buildir.Analyzer},
+		Run:      callcheck.Analyzer(rules),
+	},
+	Doc: &lint.RawDocumentation{
+		Title:    `Invalid URL in \'net/url.Parse\'`,
+		Since:    "2017.1",
+		Severity: lint.SeverityError,
+		MergeIf:  lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var rules = map[string]callcheck.Check{
+	"net/url.Parse": func(call *callcheck.Call) {
+		arg := call.Args[knowledge.Arg("net/url.Parse.rawurl")]
+		if c := callcheck.ExtractConstExpectKind(arg.Value, constant.String); c != nil {
+			s := constant.StringVal(c.Value)
+			_, err := url.Parse(s)
+			if err != nil {
+				arg.Invalid(fmt.Sprintf("%q is not a valid URL: %s", s, err))
+			}
+		}
+	},
+}