134 lines
2.4 KiB
Go
134 lines
2.4 KiB
Go
package main
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import (
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"bufio"
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"bytes"
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"database/sql"
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"fmt"
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"os"
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"strings"
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_ "github.com/mattn/go-sqlite3"
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"github.com/valyala/fasthttp"
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)
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const behindProxy = true
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var removeHeaders = map[string]bool{
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"date": true,
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"expires": true,
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"server": true,
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}
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var conn *sql.DB
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var stmt *sql.Stmt
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func main() {
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db, err := sql.Open("sqlite3", "archive.db")
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if err != nil {
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return
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}
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conn = db
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defer db.Close()
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sel_stmt, err := db.Prepare("select id, code from data where method = ? and url = ? limit 1")
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if err != nil {
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return
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}
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stmt = sel_stmt
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defer sel_stmt.Close()
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fasthttp.ListenAndServe("127.0.0.1:4001", handler)
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}
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func handler(ctx *fasthttp.RequestCtx) {
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// -- find in DB and read id+code
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uri := ctx.URI()
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var scheme []byte
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if behindProxy {
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scheme = ctx.Request.Header.Peek("X-Forwarded-Proto")
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} else {
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scheme = uri.Scheme()
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}
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host, port := parseHost(
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uri.Host(),
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bytes.Equal(scheme, []byte("https")),
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)
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row := stmt.QueryRow(
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string(ctx.Method()),
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fmt.Sprintf(
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"%s://%s:%s%s",
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scheme,
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host,
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port,
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ctx.RequestURI(),
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),
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)
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var id int
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var code int
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err := row.Scan(&id, &code)
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if err == sql.ErrNoRows {
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ctx.Response.SetStatusCode(404)
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return
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} else if err != nil {
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ctx.Response.SetStatusCode(500)
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ctx.Response.SetBodyString("Unable to fetch row: " + err.Error())
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return
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}
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// -- set status code
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if code != 0 {
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ctx.Response.SetStatusCode(code)
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}
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// -- find in FS and read headers+body
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path := "storage/" + string(id)
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fh, err := os.Open(path + "/headers")
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if err != nil {
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ctx.Response.SetStatusCode(500)
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ctx.Response.SetBodyString("Unable to read headers: " + err.Error())
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return
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}
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sc := bufio.NewScanner(fh)
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for sc.Scan() {
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header := strings.SplitN(sc.Text(), ": ", 2)
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name, value := strings.ToLower(header[0]), header[1]
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if removeHeaders[name] {
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continue
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}
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ctx.Response.Header.Add(name, value)
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}
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fh.Close()
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fb, err := os.Open(path + "/body")
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if err != nil {
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ctx.Response.SetStatusCode(500)
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ctx.Response.SetBodyString("Unable to read body: " + err.Error())
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return
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}
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ctx.Response.SetBodyStream(fb, -1)
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}
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func parseHost(host []byte, https bool) ([]byte, []byte) {
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idx := bytes.LastIndex(host, []byte(":"))
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var resHost, port []byte
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if idx != -1 {
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resHost = host[:idx]
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port = host[idx+1:]
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} else {
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resHost = host
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if https {
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port = []byte("443")
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} else {
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port = []byte("80")
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}
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}
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return resHost, port
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}
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