redirects.go

package main

import (
	"bytes"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strconv"
	"strings"

	"github.com/kjk/u"
)

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1348|article/Laws-of-marketing-22-resources.html
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1349|article/You-and-your-research.html
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1355|article/Principle-of-good-design-discoverability.html
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1361|article/C-Interfaces-and-Implementations.html
1361|blog/2002/08/03/c-interfaces-and-implementations.html
1364|article/Stuff-costs-more-than-you-think.html
1364|blog/2002/08/05/stuff-costs-more-than-you-think.html
1381|article/On-writing-well.html
1381|blog/2002/08/21/on-writing-well.html
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1389|blog/2002/08/28/the-future-is-here-its-just-not-evenly-distribut.html
1395|article/Quote-from-Net-Words.html
1395|blog/2002/09/03/quote-from-net-words.html
1399|article/The-stupidest-thing-a-software-company-can-do.html
1399|blog/2002/09/04/the-stupidest-thing-a-software-company-can-do.html
1408|article/A-lesson-in-marketing-needed.html
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1414|article/Great-business-without-innovation.html
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1418|article/Youll-have-a-job.html
1418|blog/2002/09/17/youll-have-a-job.html
1445|article/High-level-not-so-good.html
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1467|article/Good-programming-practices.html
1467|blog/2002/11/17/good-programming-practices.html
1476|article/Blown-to-bits.html
1476|blog/2002/12/14/blown-to-bits.html
1478|article/Recruitment-is-like-dating.html
1478|blog/2002/12/16/recruitment-is-like-dating.html
1481|article/Selling-Microsoft.html
1481|blog/2002/12/19/selling-microsoft.html
1508|article/Source-Insight-35.html
1508|blog/2003/01/20/source-insight-3-5.html
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1530|blog/2003/01/31/old-arsdigita-content.html
1599|article/Do-you-read-the-old-papers.html
1599|blog/2003/04/26/do-you-read-the-old-papers.html
1640|article/Given-enough-eyeballs-make-all-bugs-shallow.html
1640|blog/2003/06/05/given-enough-eyeballs-make-all-bugs-shallow.html
1644|article/Writing-to-sell.html
1644|blog/2003/06/13/writing-to-sell.html
1647|article/Another-ArsDigita-story.html
1647|blog/2003/06/20/another-arsdigita-story.html
1649|article/My-future-is-so-bright-that-Ill-need-to-wear-sun.html
1649|blog/2003/06/23/my-future-is-so-bright-that-ill-need-to-wear-sun.html
1650|article/Why-consistency-is-important-in-software-design.html
1650|blog/2003/06/25/why-consistency-is-important-in-software-design.html
1653|article/Software-can-always-be-better.html
1653|blog/2003/06/28/software-can-always-be-better.html
1654|article/Programmers-dont-steal-enough.html
1654|blog/2003/06/30/programmers-dont-steal-enough.html
1656|article/OReilly-on-software.html
1656|blog/2003/07/03/oreilly-on-software.html
1659|article/How-much-can-you-make-writing-computer-books.html
1659|blog/2003/07/09/how-much-can-you-make-writing-computer-books.html
1663|article/Memex-sue-me-please-device.html
1663|blog/2003/07/15/memex-sue-me-please-device.html
1670|article/Century-dictionary-on-line.html
1670|blog/2003/07/23/century-dictionary-on-line.html
1672|article/Lucene-for-searching-source-code.html
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1694|article/Not-as-happy-as-you-thought-you-will-be.html
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1697|article/Critical-reading-skills.html
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1719|article/A-shameless-rip-off-or-what-did-you-expect.html
1719|blog/2003/10/14/a-shameless-rip-off-or-what-did-you-expect.html
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1744|article/Myths-Open-Source-Developers-Tell-Ourselves.html
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1841|article/Microsoft-leading-the-way-with-open-bug-database.html
1841|blog/2004/06/30/microsoft-leading-the-way-with-open-bug-database.html
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`

var redirects = [][]string{
	{"/index.html", "/"},
	{"/blog", "/"},
	{"/blog/", "/"},
	{"/kb/serialization-in-c#.html", "/article/Serialization-in-C.html"},
	{"/extremeoptimizations", "/extremeoptimizations/index.html"},
	{"/extremeoptimizations/", "/extremeoptimizations/index.html"},
	{"/feed/rss2/atom.xml", "/atom.xml"},
	{"/feed/rss2/", "/atom.xml"},
	{"/feed/rss2", "/atom.xml"},
	{"/feed/", "/atom.xml"},
	{"/feed", "/atom.xml"},
	{"/feedburner.xml", "/atom.xml"},
	{"/articles/cocoa-objectivec-reference.html", "/articles/cocoa-reference.html"},
	{"/forum_sumatra", "https://forum.sumatrapdfreader.org/"},
	{"/google6dba371684d43cd6.html", "/static/google6dba371684d43cd6.html"},
	{"/software/15minutes/index.html", "/software/15minutes.html"},
	{"/software/15minutes/", "/software/15minutes.html"},
	{"/software/fofou", "/software/fofou/index.html"},
	{"/software/dbhero", "/software/dbhero/index.html"},
	{"/software/patheditor", "/software/patheditor/for-windows.html"},
	{"/software/patheditor/", "/software/patheditor/for-windows.html"},
	{"/software/scdiff/", "/software/scdiff.html"},
	{"/software/scdiff/index.html", "/software/scdiff.html"},
	{"/software/sumatra", "https://www.sumatrapdfreader.org/free-pdf-reader.html"},
	{"/software/sumatrapdf", "https://www.sumatrapdfreader.org/free-pdf-reader.html"},
	{"/software/sumatrapdf/", "https://www.sumatrapdfreader.org/free-pdf-reader.html"},
	{"/software/sumatrapdf/index.html", "https://www.sumatrapdfreader.org/free-pdf-reader.html"},
	{"/software/sumatrapdf/download.html", "https://www.sumatrapdfreader.org/download-free-pdf-viewer.html"},
	{"/software/sumatrapdf/prerelase.html", "https://www.sumatrapdfreader.org/prerelease.html"},
	{"/free-pdf-reader.html", "https://www.sumatrapdfreader.org/free-pdf-reader.html"},
	{"/software/volante", "/software/volante/database.html"},
	{"/software/volante/", "/software/volante/database.html"},
	{"/software/volante/index.html", "/software/volante/database.html"},
	{"/software/fotofi", "/software/fotofi/free-stock-photos.html"},
	{"/software/fotofi/", "/software/fotofi/free-stock-photos.html"},
	{"/software/fotofi/index.html", "/software/fotofi/free-stock-photos.html"},
	{"/software/fast-file-finder-for-windows", "/software/fast-file-finder-for-windows/"},
	{"/software/fast-file-finder-for-windows/index.html", "/software/fast-file-finder-for-windows/"},
	{"/static/software.html", "/software/index.html"},
	{"/static/krzysztof.html", "/resume.html"},
	{"/static/resume.html", "/resume.html"},
}

var articleRedirects = make(map[string]string)

func readRedirects(store *Articles) {
	d := []byte(articleRedirectsTxt)
	lines := bytes.Split(d, []byte{'\n'})
	for _, l := range lines {
		if len(l) == 0 {
			continue
		}
		parts := strings.Split(string(l), "|")
		panicIf(len(parts) != 2, "malformed article_redirects.txt, len(parts) = %d (!2)", len(parts))
		idStr := parts[0]
		url := strings.TrimSpace(parts[1])
		idNum, err := strconv.Atoi(idStr)
		panicIf(err != nil, "malformed line in article_redirects.txt. Line:\n%s\nError: %s\n", l, err)
		id := u.EncodeBase64(idNum)
		a := store.idToArticle[id]
		if a != nil {
			articleRedirects[url] = id
			continue
		}
		//verbose("skipping redirect '%s' because article with id %d no longer present\n", string(l), id)
	}
}

var (
	netlifyRedirects []*netlifyRedirect
)

type netlifyRedirect struct {
	from string
	to   string
	// valid code is 301, 302, 200, 404
	code int
}

func netlifyAddRedirect(from, to string, code int) {
	r := netlifyRedirect{
		from: from,
		to:   to,
		code: code,
	}
	netlifyRedirects = append(netlifyRedirects, &r)
}

func netlifyAddRewrite(from, to string) {
	netlifyAddRedirect(from, to, 200)
}

func netflifyAddTempRedirect(from, to string) {
	netlifyAddRedirect(from, to, 302)
}

func netlifyAddStaticRedirects() {
	for _, redirect := range redirects {
		from := redirect[0]
		to := redirect[1]
		netflifyAddTempRedirect(from, to)
	}
}

func netlifyAddArticleRedirects(store *Articles) {
	for from, articleID := range articleRedirects {
		from = "/" + from
		article := store.idToArticle[articleID]
		panicIf(article == nil, "didn't find article for id '%s'", articleID)
		to := article.URL()
		netflifyAddTempRedirect(from, to) // TODO: change to permanent
	}

}

// redirect /article/:id/* => /article/:id/pretty-title
const netlifyRedirectsProlog = `/article/:id/*	/article/:id.html	200
`

func netlifyWriteRedirects() {
	buf := bytes.NewBufferString(netlifyRedirectsProlog)
	for _, r := range netlifyRedirects {
		s := fmt.Sprintf("%s\t%s\t%d\n", r.from, r.to, r.code)
		buf.WriteString(s)
	}
	netlifyWriteFile("_redirects", buf.Bytes())
}

// https://caddyserver.com/tutorial/caddyfile
// redirect /article/:id/* => /article/:id/pretty-title
var caddyProlog = `http://www.minazuki.cn https://www.minazuki.cn {
tls /etc/letsencrypt/live/www.minazuki.cn/cert.pem /etc/letsencrypt/live/www.minazuki.cn/privkey.pem
gzip
        proxy / http://127.0.0.1:8080 {
                header_upstream Host {host}
                header_upstream X-Real-IP {remote}
                header_upstream X-Forwarded-For {remote}
                header_upstream X-Forwarded-Proto {scheme}
        }
}
0.0.0.0:8080
root netlify_static
errors stdout
log stdout

rewrite / {
	r  ^/article/(.*)/.*$
	to /article/{1}.html
}

`

func isRewrite(r *netlifyRedirect) bool {
	return (r.code == 200) || strings.HasSuffix(r.from, "*")
}

func genCaddyRedir(r *netlifyRedirect) string {
	if r.from == "/" {
		return fmt.Sprintf("rewrite / %s\n", r.to)
	}
	if isRewrite(r) {
		// hack: caddy doesn't like `++` in from
		if strings.Contains(r.from, "++") {
			return ""
		}
		if strings.HasSuffix(r.from, "*") {
			base := strings.TrimSuffix(r.from, "*")
			to := strings.Replace(r.to, ":splat", "{1}", -1)
			return fmt.Sprintf(`
rewrite "%s" {
    regexp (.*)
    to %s
}
`, base, to)
		}
		/*return fmt.Sprintf(`
rewrite "^%s$" {
    to %s
}
`, r.from, r.to)*/
		return fmt.Sprintf(`
rewrite %s {
    to %s
}
`, r.from, r.to)
	}

	return fmt.Sprintf("redir \"%s\" \"%s\" %d\n", r.from, r.to, r.code)
}

func writeCaddyConfig() {
	path := filepath.Join("Caddyfile")
	f, err := os.Create(path)
	panicIfErr(err)
	defer f.Close()

	_, err = f.Write([]byte(caddyProlog))
	panicIfErr(err)
	for _, r := range netlifyRedirects {
		s := genCaddyRedir(r)
		_, err = io.WriteString(f, s)
		panicIfErr(err)
	}
}