73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
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package reqline
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import (
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"regexp"
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"fmt"
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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 (r *T) extractHttpMethod(b []byte) error {
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switch string(b) {
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case "OPTIONS": r.method = OPTIONS
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case "GET": r.method = GET
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case "HEAD": r.method = HEAD
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case "POST": r.method = POST
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case "PUT": r.method = PUT
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case "DELETE": r.method = DELETE
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default:
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return fmt.Errorf("Unknown HTTP method '%s'", 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 (r *T) extractURI(b []byte) error {
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/* (1) Check format */
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checker := regexp.MustCompile("^(?:/[^/]+)*/?$")
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if !checker.Match(b) {
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return fmt.Errorf("Invalid URI format, expected an absolute path (starts with /), got '%s'", b)
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}
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/* (2) Store */
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r.uri = string(b)
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return nil
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}
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// extractHttpVersion extracts the version and checks for errors
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// allowed format: [1-9] or [1.9].[0-9]
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func (r *T) extractHttpVersion(b []byte) error {
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/* (1) Extract version parts */
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extractor := regexp.MustCompile(`^HTTP/([1-9])(?:\.([0-9]))?$`);
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if !extractor.Match(b) {
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return fmt.Errorf("Cannot parse HTTP version, expected INT or INT.INT, got '%s'", b)
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}
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/* (2) Extract version number */
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matches := extractor.FindSubmatch(b)
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var version byte = matches[1][0] - '0'
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/* (3) Extract subversion (if exists) */
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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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/* (4) Store version (x 10 to fit uint8) */
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r.version = version * 10 + subVersion
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return nil
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}
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