fix: cnf make cnf/* configuration formats more strict and not to include themselves (to really find out the good format) | add tests | TODO: json is a subset of yaml, create my own YAML parser that is strict to the 'well-known' YAML syntax

internal/cnf/ini.go

@@ -16,8 +16,15 @@ type ini struct {
 // ReadFrom implements io.ReaderFrom
 func (d *ini) ReadFrom(_reader io.Reader) (int64, error) {
 
+	// disallow "key: value"
+	// when trying to find out the format from content
+	// and avoids conflicts with YAML
+	opts := lib.LoadOptions{
+		KeyValueDelimiters: "=",
+	}
+
+	file, err := lib.LoadSources(opts, ioutil.NopCloser(_reader))
 	// 1. get json decoder
-	file, err := lib.Load(ioutil.NopCloser(_reader))
 	if err != nil {
 		return 0, err
 	}

internal/cnf/loader.go

@@ -2,7 +2,6 @@ package cnf
 
 import (
 	"errors"
-	"fmt"
 	"os"
 	"path/filepath"
 )
@@ -13,39 +12,37 @@ var ErrUnknownExtension = errors.New("unknown extension format")
 // ErrUnknownFormat is raised when the format cannot be guessed from the content of the file
 var ErrUnknownFormat = errors.New("cannot infer format from content")
 
+// ErrUnknownFormat is raised when required file does not exist
+var ErrFileNotExist = errors.New("cannot find file")
+
 // Load the current file and create the configuration format accordingly
 func Load(path string) (ConfigurationFormat, error) {
 
-	var confFormat ConfigurationFormat
-
 	// 1. check file
 	if _, err := os.Stat(path); os.IsNotExist(err) {
-		return nil, fmt.Errorf("cannot find file '%s'", path)
+		return nil, ErrFileNotExist
 	}
 
 	// 2. Try to load from extension
 	extension := filepath.Ext(path)
 	if len(extension) > 0 {
 
-		confFormat = loadFromExtension(extension)
+		if confFormat := loadFromExtension(extension); confFormat != nil {
-		if confFormat == nil {
-			return nil, ErrUnknownExtension
-		}
 
-		// open file
+			// open file
-		file, err := os.Open(path)
+			file, err := os.Open(path)
-		if err != nil {
+			if err != nil {
-			return nil, err
+				return nil, err
-		}
+			}
-		defer file.Close()
 
-		// parse
+			// parse
-		_, err = confFormat.ReadFrom(file)
+			_, err = confFormat.ReadFrom(file)
-		if err == nil {
+			file.Close()
-			return confFormat, nil
+			if err == nil {
-		}
+				return confFormat, nil
+			}
 
-		// return nil, fmt.Errorf("cannot parse file as '%s' | %s", extension, err)
+		}
 
 	}
 
@@ -89,7 +86,7 @@ func loadFromContent(path string) (ConfigurationFormat, error) {
 	defer file.Close()
 
 	// extensions ordered by strictness of the language's syntax
-	extensions := []string{".json", ".nginx", ".yaml", ".ini"}
+	extensions := []string{".json", ".nginx", ".ini", ".yaml"}
 
 	// try to load each available extension
 	for _, ext := range extensions {

internal/cnf/loader_test.go

@@ -0,0 +1,250 @@
+package cnf
+
+import (
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestLoadFileNotExist(t *testing.T) {
+
+	_, err := Load("/tmp/not-existing/file")
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+	if err != ErrFileNotExist {
+		t.Fatalf("expected error <%s>, got <%s>", ErrFileNotExist, err)
+	}
+
+}
+func TestLoadFromExtensionWithContentMatch(t *testing.T) {
+
+	tests := []struct {
+		File    string
+		Format  ConfigurationFormat
+		Content string
+		Field   string
+	}{
+
+		// key = value
+		{"/tmp/load-test.json", new(json), `{ "key": "value" }`, "key"},
+		{"/tmp/load-test.nginx", new(nginx), "key value;", "key"},
+		{"/tmp/load-test.ini", new(ini), `key = value`, "key"},
+		{"/tmp/load-test.yaml", new(yaml), "key: value", "key"},
+
+		// parent.key = value
+		{"/tmp/load-test.json", new(json), `{ "parent": { "key": "value" } }`, "parent.key"},
+		{"/tmp/load-test.nginx", new(nginx), "parent {\nkey value;\n}", "parent.key"},
+		{"/tmp/load-test.ini", new(ini), "[parent]\nkey = value", "parent.key"},
+		{"/tmp/load-test.yaml", new(yaml), "parent:\n  key: value", "parent.key"},
+
+		// comments
+		// {"/tmp/load-test.json", new(json), "{ \"parent\": { \"key\": \"value\" } }", "parent.key"},
+		{"/tmp/load-test.nginx", new(nginx), ";comment\nparent {\nkey value;\n}", "parent.key"},
+		{"/tmp/load-test.nginx", new(nginx), "#comment\nparent {\nkey value;\n}", "parent.key"},
+		{"/tmp/load-test.ini", new(ini), ";comment\n[parent]\nkey = value", "parent.key"},
+		{"/tmp/load-test.ini", new(ini), "#comment\n[parent]\nkey = value", "parent.key"},
+		{"/tmp/load-test.yaml", new(yaml), "#comment\nparent:\n  key: value", "parent.key"},
+	}
+
+	for i, test := range tests {
+
+		f, err := os.Create(test.File)
+		if err != nil {
+			t.Errorf("[%d] cannot create file '%s'", i, test.File)
+			continue
+		}
+		f.Write([]byte(test.Content))
+		f.Close()
+
+		format, err := Load(test.File)
+		if err != nil {
+			t.Errorf("[%d] unexpected error <%s>", i, err)
+			continue
+		}
+		if format == nil {
+			t.Errorf("[%d] expected format not to be null", i)
+			continue
+		}
+
+		// check type
+		have, want := fmt.Sprintf("%T", format), fmt.Sprintf("%T", test.Format)
+		if have != want {
+			t.Errorf("[%d] expected format <%s>, got <%s>", i, want, have)
+			continue
+		}
+
+		// try to get value
+		val, found := format.Get(test.Field)
+		if !found {
+			t.Errorf("[%d] expected to find '%s'", i, test.Field)
+			continue
+		}
+
+		if val != "value" {
+			t.Errorf("[%d] expected value '%s', got '%s'", i, "value", val)
+			continue
+		}
+
+	}
+
+	for _, test := range tests {
+		os.RemoveAll(test.File)
+	}
+
+}
+
+func TestLoadFromExtensionWithContentNotMatch(t *testing.T) {
+
+	tests := []struct {
+		File    string
+		Format  ConfigurationFormat
+		Content string
+		Field   string
+	}{
+
+		// [JSON] key = value
+		{"/tmp/load-test.json", new(json), `{ "key": "value" }`, "key"},
+		{"/tmp/load-test.nginx", new(json), `{ "key": "value" }`, "key"},
+		{"/tmp/load-test.ini", new(json), `{ "key": "value" }`, "key"},
+		// {"/tmp/load-test.yaml", new(json), `{ "key": "value" }`, "key"},
+
+		// [NGINX] key = value
+		{"/tmp/load-test.json", new(nginx), "key value;", "key"},
+		{"/tmp/load-test.nginx", new(nginx), "key value;", "key"},
+		{"/tmp/load-test.ini", new(nginx), "key value;", "key"},
+		// {"/tmp/load-test.yaml", new(nginx), "key value;", "key"},
+
+		// [INI] key = value
+		{"/tmp/load-test.json", new(ini), `key = value`, "key"},
+		{"/tmp/load-test.nginx", new(ini), `key = value`, "key"},
+		{"/tmp/load-test.ini", new(ini), `key = value`, "key"},
+		// {"/tmp/load-test.yaml", new(ini), `key = value`, "key"},
+
+		// [YAML] key = value
+		{"/tmp/load-test.json", new(yaml), "key: value", "key"},
+		{"/tmp/load-test.nginx", new(yaml), "key: value", "key"},
+		{"/tmp/load-test.yaml", new(yaml), "key: value", "key"},
+		{"/tmp/load-test.yaml", new(yaml), "key: value", "key"},
+	}
+
+	for i, test := range tests {
+
+		f, err := os.Create(test.File)
+		if err != nil {
+			t.Errorf("[%d] cannot create file '%s'", i, test.File)
+			continue
+		}
+		f.Write([]byte(test.Content))
+		f.Close()
+
+		format, err := Load(test.File)
+		if err != nil {
+			t.Errorf("[%d] unexpected error <%s>", i, err)
+			continue
+		}
+		if format == nil {
+			t.Errorf("[%d] expected format not to be null", i)
+			continue
+		}
+
+		// check type
+		have, want := fmt.Sprintf("%T", format), fmt.Sprintf("%T", test.Format)
+		if have != want {
+			t.Errorf("[%d] expected format <%s>, got <%s>", i, want, have)
+			continue
+		}
+
+		// try to get value
+		val, found := format.Get(test.Field)
+		if !found {
+			t.Errorf("[%d] expected to find '%s'", i, test.Field)
+			continue
+		}
+
+		if val != "value" {
+			t.Errorf("[%d] expected value '%s', got '%s'", i, "value", val)
+			continue
+		}
+
+	}
+	for _, test := range tests {
+		os.RemoveAll(test.File)
+	}
+
+}
+func TestLoadContent(t *testing.T) {
+
+	file := "/tmp/no-extension-file"
+	defer os.RemoveAll(file)
+
+	tests := []struct {
+		Format  ConfigurationFormat
+		Content string
+		Field   string
+	}{
+
+		// key = value
+		{new(json), `{ "key": "value" }`, "key"},
+		{new(nginx), "key value;", "key"},
+		{new(ini), `key = value`, "key"},
+		{new(yaml), "key: value", "key"},
+
+		// parent.key = value
+		{new(json), `{ "parent": { "key": "value" } }`, "parent.key"},
+		{new(nginx), "parent {\nkey value;\n}", "parent.key"},
+		{new(ini), "[parent]\nkey = value", "parent.key"},
+		{new(yaml), "parent:\n  key: value", "parent.key"},
+
+		// comments
+		{new(json), "{ \"parent\": { \"key\": \"value\" } }", "parent.key"},
+		{new(nginx), ";comment\nparent {\nkey value;\n}", "parent.key"},
+		{new(nginx), "#comment\nparent {\nkey value;\n}", "parent.key"},
+		{new(ini), ";comment\n[parent]\nkey = value", "parent.key"},
+		{new(ini), "#comment\n[parent]\nkey = value", "parent.key"},
+		{new(yaml), "#comment\nparent:\n  key: value", "parent.key"},
+	}
+
+	for i, test := range tests {
+
+		os.RemoveAll(file)
+		f, err := os.Create(file)
+		if err != nil {
+			t.Errorf("[%d] cannot create file '%s'", i, file)
+			continue
+		}
+		f.Write([]byte(test.Content))
+		f.Close()
+
+		format, err := Load(file)
+		if err != nil {
+			t.Errorf("[%d] unexpected error <%s>", i, err)
+			continue
+		}
+		if format == nil {
+			t.Errorf("[%d] expected format not to be null", i)
+			continue
+		}
+
+		// check type
+		have, want := fmt.Sprintf("%T", format), fmt.Sprintf("%T", test.Format)
+		if have != want {
+			t.Errorf("[%d] expected format <%s>, got <%s>", i, want, have)
+			continue
+		}
+
+		// try to get value
+		val, found := format.Get(test.Field)
+		if !found {
+			t.Errorf("[%d] expected to find '%s'", i, test.Field)
+			continue
+		}
+
+		if val != "value" {
+			t.Errorf("[%d] expected value '%s', got '%s'", i, "value", val)
+			continue
+		}
+
+	}
+
+}