95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
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package upgrade
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import (
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"bytes"
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"fmt"
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"regexp"
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)
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// RequestLine represents the HTTP Request line
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// defined in rfc-2616 : https://tools.ietf.org/html/rfc2616#section-5.1
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type RequestLine struct {
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uri string
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version byte
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}
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// Read an HTTP request line from a byte array
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//
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// implements io.Reader
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func (rl *RequestLine) Read(b []byte) (int, error) {
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var read = len(b)
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// split by spaces
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parts := bytes.Split(b, []byte(" "))
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if len(parts) != 3 {
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return read, fmt.Errorf("expected 3 space-separated elements, got %d elements", len(parts))
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}
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err := rl.extractHttpMethod(parts[0])
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if err != nil {
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return read, err
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}
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err = rl.extractURI(parts[1])
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if err != nil {
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return read, err
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}
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err = rl.extractHttpVersion(parts[2])
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if err != nil {
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return read, err
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}
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return read, nil
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}
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// URI of the request line
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func (rl RequestLine) URI() string {
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return rl.uri
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}
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// extractHttpMethod extracts the HTTP method from a []byte
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// and checks for errors
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// allowed format: OPTIONS|GET|HEAD|POST|PUT|DELETE
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func (rl *RequestLine) extractHttpMethod(b []byte) error {
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if string(b) != "GET" {
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return fmt.Errorf("invalid HTTP method '%s', expected 'GET'", b)
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}
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return nil
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}
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// extractURI extracts the URI from a []byte and checks for errors
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// allowed format: /([^/]/)*/?
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func (rl *RequestLine) extractURI(b []byte) error {
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checker := regexp.MustCompile("^(?:/[^/]+)*/?$")
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if !checker.Match(b) {
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return fmt.Errorf("invalid URI, expected an absolute path, got '%s'", b)
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}
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rl.uri = string(b)
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return nil
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}
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// extractHttpVersion extracts the version and checks for errors
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// allowed format: [1-9] or [1.9].[0-9]
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func (rl *RequestLine) extractHttpVersion(b []byte) error {
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extractor := regexp.MustCompile(`^HTTP/([1-9])(?:\.([0-9]))?$`)
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if !extractor.Match(b) {
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return fmt.Errorf("invalid HTTP version, expected INT or INT.INT, got '%s'", b)
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}
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matches := extractor.FindSubmatch(b)
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var version byte = matches[1][0] - '0'
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var subversion byte = 0
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if len(matches[2]) > 0 {
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subversion = matches[2][0] - '0'
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}
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rl.version = version*10 + subversion
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return nil
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}
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