├── README.md ├── go.mod ├── go.sum └── module.go /README.md: -------------------------------------------------------------------------------- 1 | Run commands on Caddy events 2 | ============================ 3 | 4 | This is the `events.handlers.exec` Caddy module. It executes commands to handle Caddy events. 5 | 6 | **It is EXPERIMENTAL and subject to change.** After getting some production experience, if demand is high enough and if this is generally useful to most users, we may move this into the standard Caddy distribution. It would be the only Caddy module that executes commands on the system, so we want to make sure it does not allow for _arbitrary_ commands to be executed. 7 | 8 | > [!NOTE] 9 | > This is not an official repository of the [Caddy Web Server](https://github.com/caddyserver) organization. 10 | 11 | ## Install 12 | 13 | Like any other Caddy plugin, [select it on the download page](https://caddyserver.com/download) to get a custom build, or use xcaddy to build from source: 14 | 15 | ``` 16 | $ xcaddy build --with github.com/mholt/caddy-events-exec 17 | ``` 18 | 19 | ## Usage 20 | 21 | Minimal JSON config example: 22 | 23 | ```json 24 | { 25 | "apps": { 26 | "events": { 27 | "subscriptions": [ 28 | { 29 | "events": ["cert_obtained"], 30 | "handlers": [ 31 | { 32 | "handler": "exec", 33 | "command": "systemctl", 34 | "args": ["reload", "mydaemon"] 35 | } 36 | ] 37 | } 38 | ] 39 | } 40 | } 41 | } 42 | ``` 43 | 44 | This will run `systemctl reload mydaemon` every time Caddy obtains a certificate. Of course, you will need to make sure `caddy` has permission to run any command you configure it with. 45 | 46 | Equivalent Caddyfile: 47 | 48 | ``` 49 | { 50 | events { 51 | on cert_obtained exec systemctl reload mydaemon 52 | } 53 | } 54 | ``` 55 | 56 | ## Notes 57 | 58 | This module runs commands in the _background_ by default, to avoid performance problems caused by blocking. 59 | 60 | If you want the ability to cancel an event (for example, `cert_obtaining` can be canceled to avoid getting a certificate) you must configure the command to run in the foreground as well as the exit code(s) to trigger an abort. 61 | 62 | Please be mindful of any security implications of the commands you run and how you configure this module, at least until we get more production experience. Please test it out and report any issues! 63 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/mholt/caddy-events-exec 2 | 3 | go 1.24 4 | 5 | toolchain go1.24.1 6 | 7 | require ( 8 | github.com/caddyserver/caddy/v2 v2.10.0-beta.4.0.20250329141543-5a6b2f8d1d46 9 | go.uber.org/zap v1.27.0 10 | ) 11 | 12 | require ( 13 | github.com/beorn7/perks v1.0.1 // indirect 14 | github.com/caddyserver/certmagic v0.22.2 // indirect 15 | github.com/caddyserver/zerossl v0.1.3 // indirect 16 | github.com/cespare/xxhash/v2 v2.3.0 // indirect 17 | github.com/francoispqt/gojay v1.2.13 // indirect 18 | github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect 19 | github.com/google/pprof v0.0.0-20231212022811-ec68065c825e // indirect 20 | github.com/google/uuid v1.6.0 // indirect 21 | github.com/klauspost/cpuid/v2 v2.2.10 // indirect 22 | github.com/libdns/libdns v0.2.3 // indirect 23 | github.com/mholt/acmez/v3 v3.1.1 // indirect 24 | github.com/miekg/dns v1.1.63 // indirect 25 | github.com/onsi/ginkgo/v2 v2.13.2 // indirect 26 | github.com/prometheus/client_golang v1.19.1 // indirect 27 | github.com/prometheus/client_model v0.5.0 // indirect 28 | github.com/prometheus/common v0.48.0 // indirect 29 | github.com/prometheus/procfs v0.12.0 // indirect 30 | github.com/quic-go/qpack v0.5.1 // indirect 31 | github.com/quic-go/quic-go v0.50.1 // indirect 32 | github.com/zeebo/blake3 v0.2.4 // indirect 33 | go.uber.org/mock v0.5.0 // indirect 34 | go.uber.org/multierr v1.11.0 // indirect 35 | go.uber.org/zap/exp v0.3.0 // indirect 36 | golang.org/x/crypto v0.36.0 // indirect 37 | golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect 38 | golang.org/x/mod v0.24.0 // indirect 39 | golang.org/x/net v0.37.0 // indirect 40 | golang.org/x/sync v0.12.0 // indirect 41 | golang.org/x/sys v0.31.0 // indirect 42 | golang.org/x/term v0.30.0 // indirect 43 | golang.org/x/text v0.23.0 // indirect 44 | golang.org/x/time v0.11.0 // indirect 45 | golang.org/x/tools v0.31.0 // indirect 46 | google.golang.org/protobuf v1.35.1 // indirect 47 | ) 48 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 4 | cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo= 5 | dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU= 6 | dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU= 7 | dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4= 8 | dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU= 9 | git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg= 10 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 11 | github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c= 12 | github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= 13 | github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= 14 | github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= 15 | github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g= 16 | github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s= 17 | github.com/caddyserver/caddy/v2 v2.10.0-beta.4.0.20250329141543-5a6b2f8d1d46 h1:SkviFaXmk4wSpuGbC/lISKfaB0ktk67wU88DcMXaKmE= 18 | github.com/caddyserver/caddy/v2 v2.10.0-beta.4.0.20250329141543-5a6b2f8d1d46/go.mod h1:Y/FR0lLe3Ssp97TQTwfYHCODkRm3AxLks/WPdXaHAqo= 19 | github.com/caddyserver/certmagic v0.22.2 h1:qzZURXlrxwR5m25/jpvVeEyJHeJJMvAwe5zlMufOTQk= 20 | github.com/caddyserver/certmagic v0.22.2/go.mod h1:hbqE7BnkjhX5IJiFslPmrSeobSeZvI6ux8tyxhsd6qs= 21 | github.com/caddyserver/zerossl v0.1.3 h1:onS+pxp3M8HnHpN5MMbOMyNjmTheJyWRaZYwn+YTAyA= 22 | github.com/caddyserver/zerossl v0.1.3/go.mod h1:CxA0acn7oEGO6//4rtrRjYgEoa4MFw/XofZnrYwGqG4= 23 | github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs= 24 | github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= 25 | github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= 26 | github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= 27 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 28 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 29 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 30 | github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk= 31 | github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc= 32 | github.com/francoispqt/gojay v1.2.13 h1:d2m3sFjloqoIUQU3TsHBgj6qg/BVGlTBeHDUmyJnXKk= 33 | github.com/francoispqt/gojay v1.2.13/go.mod h1:ehT5mTG4ua4581f1++1WLG0vPdaA9HaiDsoyrBGkyDY= 34 | github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= 35 | github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= 36 | github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0= 37 | github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q= 38 | github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY= 39 | github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= 40 | github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI= 41 | github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572/go.mod h1:9Pwr4B2jHnOSGXyyzV8ROjYa2ojvAY6HCGYYfMoC3Ls= 42 | github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= 43 | github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= 44 | github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E= 45 | github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= 46 | github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= 47 | github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= 48 | github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= 49 | github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek= 50 | github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps= 51 | github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ= 52 | github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M= 53 | github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI= 54 | github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY= 55 | github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ= 56 | github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck= 57 | github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs= 58 | github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc= 59 | github.com/google/pprof v0.0.0-20231212022811-ec68065c825e h1:bwOy7hAFd0C91URzMIEBfr6BAz29yk7Qj0cy6S7DJlU= 60 | github.com/google/pprof v0.0.0-20231212022811-ec68065c825e/go.mod h1:czg5+yv1E0ZGTi6S6vVK1mke0fV+FaUhNGcd6VRS9Ik= 61 | github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= 62 | github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= 63 | github.com/googleapis/gax-go v2.0.0+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY= 64 | github.com/googleapis/gax-go/v2 v2.0.3/go.mod h1:LLvjysVCY1JZeum8Z6l8qUty8fiNwE08qbEPm1M08qg= 65 | github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY= 66 | github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA= 67 | github.com/grpc-ecosystem/grpc-gateway v1.5.0/go.mod h1:RSKVYQBd5MCa4OVpNdGskqpgL2+G+NZTnrVHpWWfpdw= 68 | github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1/go.mod h1:E0B/fFc00Y+Rasa88328GlI/XbtyysCtTHZS8h7IrBU= 69 | github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU= 70 | github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU= 71 | github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck= 72 | github.com/klauspost/cpuid/v2 v2.2.10 h1:tBs3QSyvjDyFTq3uoc/9xFpCuOsJQFNPiAhYdw2skhE= 73 | github.com/klauspost/cpuid/v2 v2.2.10/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0= 74 | github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo= 75 | github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= 76 | github.com/kr/pty v1.1.3/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= 77 | github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= 78 | github.com/libdns/libdns v0.2.3 h1:ba30K4ObwMGB/QTmqUxf3H4/GmUrCAIkMWejeGl12v8= 79 | github.com/libdns/libdns v0.2.3/go.mod h1:4Bj9+5CQiNMVGf87wjX4CY3HQJypUHRuLvlsfsZqLWQ= 80 | github.com/lunixbochs/vtclean v1.0.0/go.mod h1:pHhQNgMf3btfWnGBVipUOjRYhoOsdGqdm/+2c2E2WMI= 81 | github.com/mailru/easyjson v0.0.0-20190312143242-1de009706dbe/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc= 82 | github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0= 83 | github.com/mholt/acmez/v3 v3.1.1 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h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 204 | golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 205 | golang.org/x/sys v0.0.0-20181029174526-d69651ed3497/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 206 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 207 | golang.org/x/sys v0.0.0-20190316082340-a2f829d7f35f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 208 | golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik= 209 | golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k= 210 | golang.org/x/term v0.30.0 h1:PQ39fJZ+mfadBm0y5WlL4vlM7Sx1Hgf13sMIY2+QS9Y= 211 | golang.org/x/term v0.30.0/go.mod h1:NYYFdzHoI5wRh/h5tDMdMqCqPJZEuNqVR5xJLd/n67g= 212 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 213 | golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 214 | golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY= 215 | golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4= 216 | golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= 217 | golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= 218 | golang.org/x/time v0.11.0 h1:/bpjEDfN9tkoN/ryeYHnv5hcMlc8ncjMcM4XBk5NWV0= 219 | golang.org/x/time v0.11.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg= 220 | golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 221 | golang.org/x/tools v0.0.0-20181030000716-a0a13e073c7b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 222 | golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 223 | golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY= 224 | golang.org/x/tools v0.31.0 h1:0EedkvKDbh+qistFTd0Bcwe/YLh4vHwWEkiI0toFIBU= 225 | golang.org/x/tools v0.31.0/go.mod h1:naFTU+Cev749tSJRXJlna0T3WxKvb1kWEx15xA4SdmQ= 226 | google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0= 227 | google.golang.org/api v0.0.0-20181030000543-1d582fd0359e/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0= 228 | google.golang.org/api v0.1.0/go.mod h1:UGEZY7KEX120AnNLIHFMKIo4obdJhkp2tPbaPlQx13Y= 229 | google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM= 230 | google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= 231 | google.golang.org/appengine v1.3.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= 232 | google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4= 233 | google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc= 234 | google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc= 235 | google.golang.org/genproto v0.0.0-20181029155118-b69ba1387ce2/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc= 236 | google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg= 237 | google.golang.org/genproto v0.0.0-20190306203927-b5d61aea6440/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE= 238 | google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw= 239 | google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio= 240 | google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs= 241 | google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c= 242 | google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA= 243 | google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE= 244 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 245 | gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw= 246 | gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 247 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 248 | gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 249 | gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= 250 | gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 251 | grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o= 252 | honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 253 | honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 254 | honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 255 | sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck= 256 | sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0= 257 | -------------------------------------------------------------------------------- /module.go: -------------------------------------------------------------------------------- 1 | package caddyexec 2 | 3 | import ( 4 | "context" 5 | "fmt" 6 | "os" 7 | "os/exec" 8 | "time" 9 | 10 | "slices" 11 | 12 | "github.com/caddyserver/caddy/v2" 13 | "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile" 14 | "go.uber.org/zap" 15 | ) 16 | 17 | func init() { 18 | caddy.RegisterModule(Handler{}) 19 | } 20 | 21 | // Handler implements an event handler that runs a command/program. 22 | // By default, commands are run in the background so as to not 23 | // block the Caddy goroutine. 24 | type Handler struct { 25 | // The command to execute. 26 | Command string `json:"command,omitempty"` 27 | 28 | // Arguments to the command. Placeholders are expanded 29 | // in arguments, so use caution to not introduce any 30 | // security vulnerabilities with the command. 31 | Args []string `json:"args,omitempty"` 32 | 33 | // The directory in which to run the command. 34 | Dir string `json:"dir,omitempty"` 35 | 36 | // How long to wait for the command to terminate 37 | // before forcefully closing it. Default: 30s 38 | Timeout caddy.Duration `json:"timeout,omitempty"` 39 | 40 | // If true, runs the command in the foreground, 41 | // which will block and wait for output. Only 42 | // do this if you know the command will finish 43 | // quickly! Required if you want to abort the 44 | // event. 45 | Foreground bool `json:"foreground,omitempty"` 46 | 47 | // If the command exits with any of these codes, the 48 | // event will be signaled to abort with the error. 49 | // Must be running in the foreground to apply. 50 | AbortCodes []int `json:"abort_codes,omitempty"` 51 | 52 | logger *zap.Logger 53 | } 54 | 55 | // CaddyModule returns the Caddy module information. 56 | func (Handler) CaddyModule() caddy.ModuleInfo { 57 | return caddy.ModuleInfo{ 58 | ID: "events.handlers.exec", 59 | New: func() caddy.Module { return new(Handler) }, 60 | } 61 | } 62 | 63 | // Provision sets up the module. 64 | func (eh *Handler) Provision(ctx caddy.Context) error { 65 | eh.logger = ctx.Logger(eh) 66 | 67 | if eh.Timeout <= 0 { 68 | eh.Timeout = caddy.Duration(30 * time.Second) 69 | } 70 | 71 | if len(eh.AbortCodes) > 0 && !eh.Foreground { 72 | return fmt.Errorf("must run commands in foreground to apply abort codes") 73 | } 74 | 75 | return nil 76 | } 77 | 78 | // Handle handles the event. 79 | func (eh *Handler) Handle(ctx context.Context, e caddy.Event) error { 80 | repl := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer) 81 | 82 | // expand placeholders in command args; 83 | // notably, we do not expand placeholders 84 | // in the command itself for safety reasons 85 | expandedArgs := make([]string, len(eh.Args)) 86 | for i := range eh.Args { 87 | expandedArgs[i] = repl.ReplaceAll(eh.Args[i], "") 88 | } 89 | 90 | var cancel context.CancelFunc 91 | if eh.Timeout > 0 { 92 | ctx, cancel = context.WithTimeout(ctx, time.Duration(eh.Timeout)) 93 | } 94 | 95 | cmd := exec.CommandContext(ctx, eh.Command, expandedArgs...) 96 | cmd.Dir = eh.Dir 97 | cmd.Stdout = os.Stdout 98 | cmd.Stderr = os.Stderr 99 | 100 | if eh.Foreground { 101 | if cancel != nil { 102 | defer cancel() 103 | } 104 | 105 | err := cmd.Run() 106 | 107 | exitCode := cmd.ProcessState.ExitCode() 108 | if slices.Contains(eh.AbortCodes, exitCode) { 109 | return fmt.Errorf("%w: %v", caddy.ErrEventAborted, err) 110 | } 111 | 112 | return err 113 | } 114 | 115 | go func() { 116 | if cancel != nil { 117 | defer cancel() 118 | } 119 | if err := cmd.Run(); err != nil { 120 | eh.logger.Error("background command failed", zap.Error(err)) 121 | } 122 | }() 123 | 124 | return nil 125 | } 126 | 127 | // UnmarshalCaddyfile parses the module's Caddyfile config. Syntax: 128 | // 129 | // exec 130 | func (eh *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error { 131 | for d.Next() { 132 | if !d.NextArg() { 133 | return d.ArgErr() 134 | } 135 | eh.Command = d.Val() 136 | eh.Args = d.RemainingArgs() 137 | } 138 | return nil 139 | } 140 | 141 | // Interface guards 142 | var ( 143 | _ caddyfile.Unmarshaler = (*Handler)(nil) 144 | _ caddy.Provisioner = (*Handler)(nil) 145 | ) 146 | --------------------------------------------------------------------------------