88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
package gopher
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import (
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"errors"
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"regexp"
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)
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//------------------------------------------------\\
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// + + + T Y P E S + + + \\
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//--------------------------------------------------\\
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// The url struct represents a URL for the rest of the system.
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// It includes component parts as well as a full URL string.
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type Url struct {
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Scheme string
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Host string
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Port string
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Gophertype string
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Resource string
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Full string
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IsBinary bool
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}
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//------------------------------------------------\\
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// + + + F U N C T I O N S + + + \\
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//--------------------------------------------------\\
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// MakeUrl is a Url constructor that takes in a string
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// representation of a url and returns a Url struct and
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// an error (or nil).
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func MakeUrl(u string) (Url, error) {
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var out Url
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re := regexp.MustCompile(`^((?P<scheme>gopher|http|https|ftp|telnet):\/\/)?(?P<host>[\w\-\.\d]+)(?::(?P<port>\d+)?)?(?:/(?P<type>[01345679gIhisp])?)?(?P<resource>(?:[\/|Uu].*)?)?$`)
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match := re.FindStringSubmatch(u)
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if valid := re.MatchString(u); !valid {
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return out, errors.New("Invalid URL or command character")
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}
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for i, name := range re.SubexpNames() {
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switch name {
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case "scheme":
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out.Scheme = match[i]
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case "host":
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out.Host = match[i]
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case "port":
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out.Port = match[i]
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case "type":
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out.Gophertype = match[i]
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case "resource":
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out.Resource = match[i]
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}
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}
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if out.Scheme == "" {
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out.Scheme = "gopher"
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}
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if out.Host == "" {
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return out, errors.New("No host.")
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}
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if out.Scheme == "gopher" && out.Port == "" {
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out.Port = "70"
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} else if out.Scheme == "http" || out.Scheme == "https" && out.Port == "" {
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out.Port = "80"
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}
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if out.Gophertype == "" && (out.Resource == "" || out.Resource == "/") {
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out.Gophertype = "1"
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}
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switch out.Gophertype {
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case "1", "0", "h", "7":
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out.IsBinary = false
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default:
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out.IsBinary = true
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}
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if out.Scheme == "gopher" && out.Gophertype == "" {
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out.Gophertype = "0"
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}
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out.Full = out.Scheme + "://" + out.Host + ":" + out.Port + "/" + out.Gophertype + out.Resource
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return out, nil
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}
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