From 7dccf6e8684f767b6e377d627b36ccf493947f1e Mon Sep 17 00:00:00 2001 From: "Alex Xu (Hello71)" Date: Sun, 3 Oct 2021 15:03:42 -0400 Subject: Initial commit --- .gitignore | 5 + Makefile | 82 +++++++++++++++ analytics/analytics.go | 117 +++++++++++++++++++++ analytics/analytics.service | 28 +++++ analytics/analytics.socket | 8 ++ analytics/go.mod | 18 ++++ analytics/go.sum | 181 +++++++++++++++++++++++++++++++++ inliner.py | 50 +++++++++ resume/resume.css | 241 ++++++++++++++++++++++++++++++++++++++++++++ resume/resume.html | 230 ++++++++++++++++++++++++++++++++++++++++++ resume/resume.js | 51 ++++++++++ 11 files changed, 1011 insertions(+) create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 analytics/analytics.go create mode 100644 analytics/analytics.service create mode 100644 analytics/analytics.socket create mode 100644 analytics/go.mod create mode 100644 analytics/go.sum create mode 100755 inliner.py create mode 100644 resume/resume.css create mode 100644 resume/resume.html create mode 100644 resume/resume.js diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..93cd0b9 --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +/analytics/analytics +/out +/static +*.woff2 +*.otf diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..e813d30 --- /dev/null +++ b/Makefile @@ -0,0 +1,82 @@ +MAKEFLAGS += -R -r +HTML_MINIFIER_FLAGS := \ + --collapse-boolean-attributes \ + --collapse-whitespace \ + --decode-entities \ + --minify-css \ + --minify-js \ + --remove-attribute-quotes \ + --remove-comments \ + --remove-optional-tags \ + --remove-redundant-attributes \ + --remove-tag-whitespace \ + --sort-attributes \ + --sort-class-name \ + --ignore-custom-fragments 'clamp([^;]*);' \ + --trim-custom-fragments + +WFS ?= ~/wfs/wfs.py +WFS_FLAGS := \ + --desubroutinize \ + --layout-scripts=latn \ + --layout-features-=frac,locl \ + --name-IDs= \ + --drop-tables+=gasp,prep + +deployhosts := pink red blue + +staticall := $(patsubst static/%,out/%,$(shell find static)) +staticdirs := $(sort $(dir $(staticall))) +staticfiles := $(filter-out $(staticdirs),$(staticall)) + +tocomp := $(filter %.txt %.html %.js %.css,$(staticfiles)) out/resume/index.html + +fonts := resume/EBGaramond-Italic.otf resume/EBGaramond-Regular.otf resume/EBGaramond-Medium.otf +fontssubset := $(fonts:.otf=.subset.woff2) + +all: $(staticall) out/resume $(tocomp:=.br) $(tocomp:=.gz) + +out/%: static/% + install -Dpm644 $< $@ + +%.br: % + brotli -Zc $< > $@ + +%.gz: % + zopfli -c $< > $@ + +$(staticdirs) out/resume &: + mkdir -p $@ + +out/%.html: static/%.html | $(@D) + html-minifier $(HTML_MINIFIER_FLAGS) $< -o $@ + +out/resume/index.html: resume/resume.html resume/resume.js resume/resume.css $(fontssubset) | out/resume + ./inliner.py $< | html-minifier $(HTML_MINIFIER_FLAGS) > $@ + +$(fontssubset) &: resume/resume.html $(fonts) + cd $( 1 { + httpEnd(w, r, "too many urls", 400) + } else { + http.Redirect(w, r, url[0], 303) + _, err = conn.Exec(context.Background(), "insert into events(created_ts, ip_addr, kind, details) values ($1, $2, $3, $4)", time.Now(), r.RemoteAddr, "r", url[0]) + if err != nil { + log.Printf("%v 0 303 db error: %s", r.RemoteAddr, err) + return + } + log.Printf("%v 0 303 ok", r.RemoteAddr) + } + } else { + httpEnd(w, r, "missing url for GET", 400) + } + return + } + if r.Method != "POST" { + httpEnd(w, r, "method not allowed: "+r.Method, 405) + return + } + if r.ContentLength <= 0 { + httpEnd(w, r, "length required", 411) + return + } + if r.ContentLength > 1048576 { + httpEnd(w, r, "too much data", 413) + return + } + + data, err := io.ReadAll(r.Body) + if err != nil { + httpEnd(w, r, "read error", 400) + return + } + var events []Event + if err := json.Unmarshal(data, &events); err != nil { + log.Print(err) + httpEnd(w, r, "bad json", 400) + return + } + + _, err = conn.CopyFrom( + r.Context(), + pgx.Identifier{"events"}, + []string{"created_ts", "ip_addr", "kind", "details"}, + pgx.CopyFromSlice(len(events), func(i int) ([]interface{}, error) { + return []interface{}{time.Unix(events[i].Created_ts/1000, events[i].Created_ts%1000*1000000), r.RemoteAddr, events[i].Kind, events[i].Details}, nil + }), + ) + if err != nil { + log.Printf("%v %d 500 db error: %s", r.RemoteAddr, r.ContentLength, err) + http.Error(w, "db error", 500) + } else { + httpEnd(w, r, "ok", 200) + } + }) + + l, err := getListener() + if err != nil { + log.Fatal(err) + } + fcgi.Serve(l, nil) +} diff --git a/analytics/analytics.service b/analytics/analytics.service new file mode 100644 index 0000000..461a940 --- /dev/null +++ b/analytics/analytics.service @@ -0,0 +1,28 @@ +[Unit] +Description=analytics server + +[Service] +Type=simple +ExecStart=/usr/sbin/analytics + +LockPersonality=yes +MemoryDenyWriteExecute=yes +NoNewPrivileges=yes +CapabilityBoundingSet= +PrivateDevices=yes +PrivateNetwork=yes +PrivateTmp=yes +ProtectClock=yes +ProtectControlGroups=yes +ProtectHome=yes +ProtectHostname=yes +ProtectKernelModules=yes +ProtectKernelTunables=yes +ProtectKernelLogs=yes +ProtectSystem=strict +RestrictAddressFamilies=AF_UNIX +RestrictNamespaces=yes +RestrictRealtime=yes +RestrictSUIDSGID=yes +SystemCallArchitectures=native +SystemCallFilter=@system-service diff --git a/analytics/analytics.socket b/analytics/analytics.socket new file mode 100644 index 0000000..072ac0b --- /dev/null +++ b/analytics/analytics.socket @@ -0,0 +1,8 @@ +[Unit] +Description=analytics socket + +[Socket] +ListenStream=/run/analytics.sock + +[Install] +WantedBy=sockets.target diff --git a/analytics/go.mod b/analytics/go.mod new file mode 100644 index 0000000..7c8aaf2 --- /dev/null +++ b/analytics/go.mod @@ -0,0 +1,18 @@ +module alxu.ca/analytics + +go 1.17 + +require ( + blitiri.com.ar/go/systemd v1.1.0 + github.com/jackc/chunkreader/v2 v2.0.1 // indirect + github.com/jackc/pgconn v1.10.0 // indirect + github.com/jackc/pgio v1.0.0 // indirect + github.com/jackc/pgpassfile v1.0.0 // indirect + github.com/jackc/pgproto3/v2 v2.1.1 // indirect + github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect + github.com/jackc/pgtype v1.8.1 // indirect + github.com/jackc/pgx/v4 v4.13.0 + github.com/jackc/puddle v1.1.4 // indirect + golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect + golang.org/x/text v0.3.7 // indirect +) diff --git a/analytics/go.sum b/analytics/go.sum new file mode 100644 index 0000000..92d6ee0 --- /dev/null +++ b/analytics/go.sum @@ -0,0 +1,181 @@ +blitiri.com.ar/go/systemd v1.1.0 h1:AMr7Ce/5CkvLZvGxsn/ZOagzFf3zU13rcgWdlbWMQ+Y= +blitiri.com.ar/go/systemd v1.1.0/go.mod h1:0D9Ttrh+TX+WuKQ/dJpdhFND7NYy505v6jhsWrihmPY= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs= +github.com/cockroachdb/apd v1.1.0 h1:3LFP3629v+1aKXU5Q37mxmRxX/pIu1nijXydLShEq5I= +github.com/cockroachdb/apd v1.1.0/go.mod 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v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= +gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= diff --git a/inliner.py b/inliner.py new file mode 100755 index 0000000..b37c275 --- /dev/null +++ b/inliner.py @@ -0,0 +1,50 @@ +#!/usr/bin/env python + +import base64 +import mimetypes +import os.path +import re +import sys + +ABSURL_RE = re.compile(r'''^(?:[a-z0-9+.-]+:|/)''') +def repl(func, base): + def g(m): + urlstr = m.group(1) + if urlstr[0] in ('"', "'"): + urlstr = urlstr[1:-1] + if ABSURL_RE.match(urlstr): + return m.group(0) + try: + return func(os.path.join(base, urlstr)) + except FileNotFoundError: + return m.group(0) + return g + +SCRIPT_RE = re.compile(r'''''') +def scriptrepl(urlstr): + with open(urlstr, 'r') as f: + script = f.read() + if '' in script: + raise Exception(' in script') + return f'' + +CSS_RE = re.compile(r'''''') +def cssrepl(urlstr): + with open(urlstr, 'r') as f: + return '' + +URL_RE = re.compile(r'''\burl\(("[^"]+"|'[^']+'|[^)]+)\)''') +def urlrepl(urlstr): + with open(urlstr, 'rb') as f: + return ('url(data:' + mimetypes.guess_type(urlstr)[0] + + ';base64,' + base64.b64encode(f.read()).decode('ascii') + ')') + +if __name__ == '__main__': + mimetypes.add_type('font/woff2', '.woff2') + base = os.path.dirname(sys.argv[1]) + with open(sys.argv[1], 'r') as f: + buf = f.read() + buf = SCRIPT_RE.sub(repl(scriptrepl, base), buf) + buf = CSS_RE.sub(repl(cssrepl, base), buf) + buf = URL_RE.sub(repl(urlrepl, base), buf) + sys.stdout.write(buf) diff --git a/resume/resume.css b/resume/resume.css new file mode 100644 index 0000000..04c8431 --- /dev/null +++ b/resume/resume.css @@ -0,0 +1,241 @@ +@font-face { + font-family: "EB Garamond"; + src: url(EBGaramond-Regular.subset.woff2); +} + +@font-face { + font-family: "EB Garamond"; + font-weight: 500; + src: url(EBGaramond-Medium.subset.woff2); +} + +@font-face { + font-family: "EB Garamond"; + font-style: italic; + src: url(EBGaramond-Italic.subset.woff2); +} + +* { + box-sizing: border-box; +} +body { + margin: .8em auto; + max-width: 90%; + width: 50em; + position: relative; + left: clamp(-2em,calc(25em - 45%),0em); + display: grid; + grid-template-columns: auto auto; + + font-family: "EB Garamond", serif; + font-size: 16px; + line-height: 1.38; + overflow-wrap: break-word; + text-rendering: optimizeLegibility; + background: #fff; + color: #333; +} + +address, .right { + align-self: center; +} +.left { + padding-right: .9rem; + text-align: right; + color: #246d84; +} +.right { + border-left: solid 3px #246d84; + padding: .2rem 0 0 1rem; +} +/* firefox prints grid margin wrong */ +.gap { + margin-top: .8rem; + grid-column: 1/-1; +} +.entry-header > :nth-child(1) { + flex: 60%; + max-width: max-content; + margin-right: auto; +} +.taddr { + grid-row: 1; + align-self: center; +} +b { + font-weight: 500; + font-size: 1.1em; +} +.date { + text-align: right; + margin-left: 1.2em; + max-width: max-content; + flex: 10 0 auto; + width: min-content; +} +.title { + line-height: 1.22; +} +.entry-header { + display: flex; +} +section + section { + margin-top: .7em; +} +address, .h1s { + color: #666; +} +address { + font-size: .9em; +} +.icon { + vertical-align: middle; + margin-bottom: .5ex; +} +h1, h2, h3, h4, p, ul { + margin: 0; +} +h1, h2, h3, h4 { + font-weight: normal; +} +h1 { + font-size: 3em; + margin-top: -.5ex; +} +h4 { + display: inline; +} +ul { + padding: 0; + list-style: none; +} +ul:not(.fakelist) > li { + margin-left: .1em; + /* separate list-style-type for safari <14.1 support */ + list-style-type: '◦ '; + list-style-image: url("data:image/svg+xml,"); + list-style-position: inside; +} +a { + color: #06c; + text-decoration: none; +} +a:visited { + color: #0f00b0; +} +.date-punct, .hide, .printcol { + display: none; +} +.nb { + display: inline-block; +} +abbr { + text-decoration: none; +} +.h1s { + font-size: 1.4em; + font-style: italic; +} +@media (min-width: 25em) { + .left-heavy-columns { + columns: 2 14em; + margin-right: -1.4em; + } +} +@media (max-width: 30em) { + body { + display: block; + } + h1 { + margin-bottom: -.2ex; + } + .h1s { + margin-bottom: .6ex; + } + .title, .left address { + text-align: center; + } + .left address { + columns: 2; + } + .left { + text-align: center; + padding: 0; + min-width: 0; + } + .left:not(.taddr) { + border-bottom: solid; + margin-bottom: .2rem; + } + .gap { + margin-bottom: 1rem; + } + .right { + border-left: none; + padding: 0; + } + .title { + padding: 0; + } + .nb { + display: initial; + } +} +@media (max-width: 21em) { + header, .entry-header { + display: block; + } + .date { + text-align: left; + margin: 0; + width: auto; + } + .date-punct { + display: inline; + } +} +@media print { + .noprint { + display: none; + } + body { + position: static; + margin: 0; + padding: 0; + width: 100%; + max-width: 100%; + font-size: 13px; + line-height: 1.28; + color: #000; + -webkit-print-color-adjust: exact; + } + /* workaround: safari doesn't support css columns in print */ + .left-heavy-columns { + display: none; + } + .printcol { + display: inline-block; + } + section + section { + margin-top: .6em; + } + /* override print color for firefox */ + address, .h1s { + color: transparent; + text-shadow: 0 0 #555; + } + address svg { + color: #555; + } +} +@media (prefers-contrast: high) { + .h1s, address { + color: #555; + } +} +@media (prefers-contrast: low) { + body { + background: #ccc; + } +} +@page { margin: 7mm 26mm 7mm 18mm; } diff --git a/resume/resume.html b/resume/resume.html new file mode 100644 index 0000000..982ded8 --- /dev/null +++ b/resume/resume.html @@ -0,0 +1,230 @@ + + + + + Alex Xu's Resume + + + + + + + + + +
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Alex Xu

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Generalist software developer

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Education

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Lassonde School of Engineering, B.Sc., Hons. Computer Science, York University, GPA: 7.7/9.0 (A).

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Sept. 2016–May 2020:
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  • Advanced Object Oriented Programming (A+)
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  • Design and Analysis of Algorithms (A+)
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  • Fundamentals of Data Structures (A+)
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  • Computer Architecture (A)
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  • Database Management Systems (A+)
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  • Applied Cryptography (A+)
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  • Mathematics of Cryptography (A)
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  • Network Security (A+)
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  • Advanced Object Oriented Programming (A+)
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  • Design and Analysis of Algorithms (A+)
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  • Fundamentals of Data Structures (A+)
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  • Computer Architecture (A)
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  • Database Management Systems (A+)
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  • Applied Cryptography (A+)
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  • Mathematics of Cryptography (A)
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  • Network Security (A+)
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Work

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Ethica Channel Enablement Inc, Network Engineer.

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Dec. 2018–Oct. 2019:
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Developed several core projects and provided extensive consulting on C, Linux, git, and networking.

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  • built a Buildroot-based minimal Linux infrastructure for the launch of a multi-link VPN product
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  • created a fully automated high-speed operating system installer for x86 systems using BusyBox sh
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  • created a tool for remote Linux in-place replacement using POSIX sh and BusyBox
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  • developed a GitLab CI process for generating the deployable image
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York University, Undergraduate Student Research Award researcher.

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May–Aug. 2018:
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Co-developed a Django web platform for worldwide crowdsourced hydrographic data collaboration.

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York University, Teaching assistant.

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June–July 2017:
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Taught lab sessions for 48-student Android/web development course.

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Community

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March 2020–present:
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Reported, documented, and contributed fixes for issues including Operation not permitted in Docker, sh: write error: Invalid argument, and Raspberry Pi doesn't boot, 7 blinks. Proposed changes including -fno-plt for x86 and x86_64, compressing debuginfo, and reconsidering -Os.

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September 2021:
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Implemented correct global-dynamic TLS support, fixing musl compatibility.

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July 2021:
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Implemented copy_file_range support, shrinking Wine prefixes from 200 MB to less than 1 MB.

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Linux kernel

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2012–present:
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Reported issues and submitted fixes: lkml, linuxlists. Diagnosed Cargo issue 9739 to a long-standing kernel bug, and fixed the underlying issue, resolving a deadlock in GNU Make and similar jobservers.

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December 2020:
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Discovered and reported an issue allowing full host device access from guests with virtiofsd enabled.

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June 2020:
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Built a concurrent Python web font subsetter with automatic pixel-perfect verification.

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March 2020:
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Built a concurrent Python pygments microservice, reducing TTFB from 1.1s to 0.15s on cgit.alxu.ca. Improved portability and security and reduced LOC by 66% by switching from http.server to aiohttp.

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July 2016:
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Built a C tunnel to simulate datagrams using TCP packets, fixing TCP-over-TCP overhead.

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Aug. 2014–Sept. 2017:
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Implemented cross-bit ptrace, migrated from qmake to CMake, and refactored code.

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Sept. 2008:
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Built a minimal .NET registry editor.

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Personal

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Resume

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June 2020:
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Rewrote my resume from LaTeX to modern web standards:

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  • significantly improved mobile-friendliness and blind accessibility using standard HTML and CSS
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  • reduced transfer size from 390 kB to 30 kB using aggressive inlining and font subsetting
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  • optimized loading time by minimizing size and reducing round trips using HTTP/2 server push
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Skills

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Alpine, Debian Linux; FreeBSD; Docker; Git; NGINX; WireGuard; TCP/IP; HTTP(S); DNS; SSH

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Programming

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C; C++; Go; Python; bash, POSIX sh; GNU make; HTML; CSS; JavaScript; SQL

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+ + + diff --git a/resume/resume.js b/resume/resume.js new file mode 100644 index 0000000..3f33976 --- /dev/null +++ b/resume/resume.js @@ -0,0 +1,51 @@ +(function(w, d, a){ + 'use strict'; + if (d.documentMode) + ie.style.display = "block"; + else + ie.parentNode.removeChild(ie); + const css = d.styleSheets[0]; + if (w.safari) { + css.insertRule("@page{margin:10mm}", css.cssRules.length); + css.insertRule("@media print{body{margin:-2mm 0 -2mm 0;padding:0 15mm 0 7mm}}", css.cssRules.length); + } + else if (w.chrome) + css.insertRule("@page{margin-top:auto;margin-bottom:auto}", css.cssRules.length); + let t, p = []; + const f = () => { + clearTimeout(t); + navigator.sendBeacon('/analytics', new Blob([JSON.stringify(p)], {type: 'application/json'})); + p = []; + }; + const q = (kind, details) => { + clearTimeout(t); + p.push({created_ts: Date.now(), kind: kind, details: details}); + t = setTimeout(f, 2000); + }; + q('l', ''); + d[a]('visibilitychange', () => { + const vs = d.visibilityState; + q('v', vs); + if (vs === 'hidden') + f(); + }); + d[a]('click', e => { + const a = e.target.closest('a'); + if (a) + q('c', a.href); + }); + w[a]('beforeprint', () => { + for (let el of d.getElementsByTagName('a')) { + const h = el.href.replace(/javascript:location=(.*);void 0/, '$1'); + el.setAttribute('data-href', el.href); + if (h != el.href) el.href = eval(h); + else el.href = "https://alxu.ca/analytics?url=" + el.href.replace(/%/g, '%25').replace(/&/g, '%26').replace(/;/g, '%3B'); + } + }); + w[a]('afterprint', function () { + for (let el of d.getElementsByTagName('a')) { + el.href = el.getAttribute('data-href'); + el.removeAttribute('data-href'); + } + }); +}(window, document, 'addEventListener')); -- cgit v1.2.3-54-g00ecf