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package schema |
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import ( |
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"errors" |
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"fmt" |
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"io" |
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"net/http" |
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"net/url" |
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"os" |
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"path/filepath" |
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) |
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// Type defines an enumeration for different schema types. |
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type Type int |
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const ( |
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// URL represents a schema type for URLs. |
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URL Type = iota |
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// File represents a schema type for file paths. |
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File |
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// Inline represents a schema type for inline data. |
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Inline |
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) |
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// Loader is a struct that holds a map of loader functions, each corresponding to a Type. |
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type Loader struct { |
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// loaders is a map where each Type is associated with a corresponding function |
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// that takes a string as input and returns a string and an error. |
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// These functions are responsible for loading data based on the Type. |
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loaders map[Type]func(string) (string, error) |
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} |
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// NewSchemaLoader initializes and returns a new Loader instance. |
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// It sets up the map of loader functions for each Type. |
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func NewSchemaLoader() *Loader { |
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return &Loader{ |
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loaders: map[Type]func(string) (string, error){ |
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// URL loader function for handling URL type schemas. |
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URL: loadFromURL, |
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// File loader function for handling file path type schemas. |
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File: loadFromFile, |
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// Inline loader function for handling inline type schemas. |
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Inline: loadInline, |
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}, |
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} |
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} |
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// LoadSchema loads a schema based on its type |
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func (s *Loader) LoadSchema(input string) (string, error) { |
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schemaType, err := determineSchemaType(input) |
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if err != nil { |
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return "", fmt.Errorf("error determining schema type: %w", err) |
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} |
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loaderFunc, exists := s.loaders[schemaType] |
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if !exists { |
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return "", fmt.Errorf("loader function not found for schema type: %v", schemaType) |
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} |
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return loaderFunc(input) |
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} |
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// determineSchemaType determines the type of schema based on the input string |
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func determineSchemaType(input string) (Type, error) { |
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if isURL(input) { |
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return URL, nil |
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} |
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valid, err := isFilePath(input) |
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if err != nil { |
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return Inline, nil |
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} |
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if valid { |
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return File, nil |
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} |
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return Inline, nil |
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} |
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func isURL(input string) bool { |
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parsedURL, err := url.Parse(input) |
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if err != nil { |
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return false |
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} |
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// Check if the URL has a valid scheme and host |
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return parsedURL.Scheme != "" && parsedURL.Host != "" |
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} |
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func isFilePath(input string) (bool, error) { |
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_, err := os.Stat(input) |
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if err != nil { |
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if os.IsNotExist(err) { |
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return false, errors.New("file does not exist") |
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} |
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if os.IsPermission(err) { |
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return false, errors.New("permission denied") |
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} |
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return false, err |
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} |
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return true, nil |
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} |
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func loadFromURL(inputURL string) (string, error) { |
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// Parse and validate the URL |
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parsedURL, err := url.Parse(inputURL) |
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if err != nil { |
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return "", err |
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} |
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// Add checks here to validate the scheme, host, etc., of parsedURL |
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// For example, ensure the scheme is either http or https |
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if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" { |
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return "", errors.New("invalid URL scheme") |
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} |
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// Perform the HTTP GET request |
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resp, err := http.Get(parsedURL.String()) |
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if err != nil { |
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return "", err |
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} |
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defer resp.Body.Close() |
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// Read the response body |
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body, err := io.ReadAll(resp.Body) |
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if err != nil { |
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return "", err |
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} |
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return string(body), nil |
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} |
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func loadFromFile(path string) (string, error) { |
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// Clean the path |
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cleanPath := filepath.Clean(path) |
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// Check if the cleaned path is trying to traverse directories |
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if filepath.IsAbs(cleanPath) || filepath.HasPrefix(cleanPath, "..") { |
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return "", errors.New("invalid file path") |
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} |
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content, err := os.ReadFile(path) |
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if err != nil { |
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return "", err |
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} |
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return string(content), nil |
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} |
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// loadInline is a function that handles inline schema types. |
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func loadInline(schema string) (string, error) { |
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// Add validation if necessary. For example: |
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if schema == "" { |
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return "", errors.New("schema is empty") |
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} |
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return schema, nil |
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} |
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Permify /
permify
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