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add example for sending email through external smtp provider

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to serve as documentation. based on issue #105.
This commit is contained in:
Mechiel Lukkien 2024-01-01 15:12:40 +01:00
parent fce3a5bf73
commit 3f5823de31
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3 changed files with 245 additions and 123 deletions
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48
config/doc.go
View file

@ -1239,6 +1239,54 @@ examples with "mox example", and print a specific example with "mox example
ResponseHeaders:
X-Frame-Options: deny
X-Content-Type-Options: nosniff
# Example transport
# Snippet for mox.conf, defining a transport called Example that connects on the
# SMTP submission with TLS port 465 ("submissions), authenticating with
# SCRAM-SHA-256-PLUS (other providers may not support SCRAM-SHA-256-PLUS, but they
# typically do support the older CRAM-MD5).:
# Transport are mechanisms for delivering messages. Transports can be referenced
# from Routes in accounts, domains and the global configuration. There is always
# an implicit/fallback delivery transport doing direct delivery with SMTP from the
# outgoing message queue. Transports are typically only configured when using
# smarthosts, i.e. when delivering through another SMTP server. Zero or one
# transport methods must be set in a transport, never multiple. When using an
# external party to send email for a domain, keep in mind you may have to add
# their IP address to your domain's SPF record, and possibly additional DKIM
# records. (optional)
Transports:
Example:
# Submission SMTP over a TLS connection to submit email to a remote queue.
# (optional)
Submissions:
# Host name to connect to and for verifying its TLS certificate.
Host: smtp.example.com
# If set, authentication credentials for the remote server. (optional)
Auth:
Username: user@example.com
Password: test1234
Mechanisms:
# Allowed authentication mechanisms. Defaults to SCRAM-SHA-256-PLUS,
# SCRAM-SHA-256, SCRAM-SHA-1-PLUS, SCRAM-SHA-1, CRAM-MD5. Not included by default:
# PLAIN. Specify the strongest mechanism known to be implemented by the server to
# prevent mechanism downgrade attacks. (optional)
- SCRAM-SHA-256-PLUS
# Snippet for domains.conf, specifying a route that sends through the transport:
# Routes for delivering outgoing messages through the queue. Each delivery attempt
# evaluates account routes, domain routes and finally these global routes. The
# transport of the first matching route is used in the delivery attempt. If no
# routes match, which is the default with no configured routes, messages are
# delivered directly from the queue. (optional)
Routes:
-
Transport: Example
*/
package config

197
examples.go Normal file
View file

@ -0,0 +1,197 @@
package main
import (
"fmt"
"log"
"strings"
"github.com/mjl-/sconf"
"github.com/mjl-/mox/config"
)
func cmdExample(c *cmd) {
c.params = "[name]"
c.help = `List available examples, or print a specific example.`
args := c.Parse()
if len(args) > 1 {
c.Usage()
}
var match func() string
for _, ex := range examples {
if len(args) == 0 {
fmt.Println(ex.Name)
} else if args[0] == ex.Name {
match = ex.Get
}
}
if len(args) == 0 {
return
}
if match == nil {
log.Fatalln("not found")
}
fmt.Print(match())
}
var examples = []struct {
Name string
Get func() string
}{
{
"webhandlers",
func() string {
const webhandlers = `# Snippet of domains.conf to configure WebDomainRedirects and WebHandlers.
# Redirect all requests for mox.example to https://www.mox.example.
WebDomainRedirects:
mox.example: www.mox.example
# Each request is matched against these handlers until one matches and serves it.
WebHandlers:
-
# Redirect all plain http requests to https, leaving path, query strings, etc
# intact. When the request is already to https, the destination URL would have the
# same scheme, host and path, causing this redirect handler to not match the
# request (and not cause a redirect loop) and the webserver to serve the request
# with a later handler.
LogName: redirhttps
Domain: www.mox.example
PathRegexp: ^/
# Could leave DontRedirectPlainHTTP at false if it wasn't for this being an
# example for doing this redirect.
DontRedirectPlainHTTP: true
WebRedirect:
BaseURL: https://www.mox.example
-
# The name of the handler, used in logging and metrics.
LogName: staticmjl
# With ACME configured, each configured domain will automatically get a TLS
# certificate on first request.
Domain: www.mox.example
PathRegexp: ^/who/mjl/
WebStatic:
StripPrefix: /who/mjl
# Requested path /who/mjl/inferno/ resolves to local web/mjl/inferno.
# If a directory contains an index.html, it is served when a directory is requested.
Root: web/mjl
# With ListFiles true, if a directory does not contain an index.html, the contents are listed.
ListFiles: true
ResponseHeaders:
X-Mox: hi
-
LogName: redir
Domain: www.mox.example
PathRegexp: ^/redir/a/b/c
# Don't redirect from plain HTTP to HTTPS.
DontRedirectPlainHTTP: true
WebRedirect:
# Just change the domain and add query string set fragment. No change to scheme.
# Path will start with /redir/a/b/c (and whathever came after) because no
# OrigPathRegexp+ReplacePath is set.
BaseURL: //moxest.example?q=1#frag
# Default redirection is 308 - Permanent Redirect.
StatusCode: 307
-
LogName: oldnew
Domain: www.mox.example
PathRegexp: ^/old/
WebRedirect:
# Replace path, leaving rest of URL intact.
OrigPathRegexp: ^/old/(.*)
ReplacePath: /new/$1
-
LogName: app
Domain: www.mox.example
PathRegexp: ^/app/
WebForward:
# Strip the path matched by PathRegexp before forwarding the request. So original
# request /app/api become just /api.
StripPath: true
# URL of backend, where requests are forwarded to. The path in the URL is kept,
# so for incoming request URL /app/api, the outgoing request URL has path /app-v2/api.
# Requests are made with Go's net/http DefaultTransporter, including using
# HTTP_PROXY and HTTPS_PROXY environment variables.
URL: http://127.0.0.1:8900/app-v2/
# Add headers to response.
ResponseHeaders:
X-Frame-Options: deny
X-Content-Type-Options: nosniff
`
// Parse just so we know we have the syntax right.
// todo: ideally we would have a complete config file and parse it fully.
var conf struct {
WebDomainRedirects map[string]string
WebHandlers []config.WebHandler
}
err := sconf.Parse(strings.NewReader(webhandlers), &conf)
xcheckf(err, "parsing webhandlers example")
return webhandlers
},
},
{
"transport",
func() string {
const moxconf = `# Snippet for mox.conf, defining a transport called Example that connects on the
# SMTP submission with TLS port 465 ("submissions), authenticating with
# SCRAM-SHA-256-PLUS (other providers may not support SCRAM-SHA-256-PLUS, but they
# typically do support the older CRAM-MD5).:
# Transport are mechanisms for delivering messages. Transports can be referenced
# from Routes in accounts, domains and the global configuration. There is always
# an implicit/fallback delivery transport doing direct delivery with SMTP from the
# outgoing message queue. Transports are typically only configured when using
# smarthosts, i.e. when delivering through another SMTP server. Zero or one
# transport methods must be set in a transport, never multiple. When using an
# external party to send email for a domain, keep in mind you may have to add
# their IP address to your domain's SPF record, and possibly additional DKIM
# records. (optional)
Transports:
Example:
# Submission SMTP over a TLS connection to submit email to a remote queue.
# (optional)
Submissions:
# Host name to connect to and for verifying its TLS certificate.
Host: smtp.example.com
# If set, authentication credentials for the remote server. (optional)
Auth:
Username: user@example.com
Password: test1234
Mechanisms:
# Allowed authentication mechanisms. Defaults to SCRAM-SHA-256-PLUS,
# SCRAM-SHA-256, SCRAM-SHA-1-PLUS, SCRAM-SHA-1, CRAM-MD5. Not included by default:
# PLAIN. Specify the strongest mechanism known to be implemented by the server to
# prevent mechanism downgrade attacks. (optional)
- SCRAM-SHA-256-PLUS
`
const domainsconf = `# Snippet for domains.conf, specifying a route that sends through the transport:
# Routes for delivering outgoing messages through the queue. Each delivery attempt
# evaluates account routes, domain routes and finally these global routes. The
# transport of the first matching route is used in the delivery attempt. If no
# routes match, which is the default with no configured routes, messages are
# delivered directly from the queue. (optional)
Routes:
-
Transport: Example
`
var static struct {
Transports map[string]config.Transport
}
var dynamic struct {
Routes []config.Route
}
err := sconf.Parse(strings.NewReader(moxconf), &static)
xcheckf(err, "parsing moxconf example")
err = sconf.Parse(strings.NewReader(domainsconf), &dynamic)
xcheckf(err, "parsing domainsconf example")
return moxconf + "\n\n" + domainsconf
},
},
}

123
main.go
View file

@ -1086,129 +1086,6 @@ domain and create the TLSA DNS records it suggests to enable DANE.
}
}
var examples = []struct {
Name string
Get func() string
}{
{
"webhandlers",
func() string {
const webhandlers = `# Snippet of domains.conf to configure WebDomainRedirects and WebHandlers.
# Redirect all requests for mox.example to https://www.mox.example.
WebDomainRedirects:
mox.example: www.mox.example
# Each request is matched against these handlers until one matches and serves it.
WebHandlers:
-
# Redirect all plain http requests to https, leaving path, query strings, etc
# intact. When the request is already to https, the destination URL would have the
# same scheme, host and path, causing this redirect handler to not match the
# request (and not cause a redirect loop) and the webserver to serve the request
# with a later handler.
LogName: redirhttps
Domain: www.mox.example
PathRegexp: ^/
# Could leave DontRedirectPlainHTTP at false if it wasn't for this being an
# example for doing this redirect.
DontRedirectPlainHTTP: true
WebRedirect:
BaseURL: https://www.mox.example
-
# The name of the handler, used in logging and metrics.
LogName: staticmjl
# With ACME configured, each configured domain will automatically get a TLS
# certificate on first request.
Domain: www.mox.example
PathRegexp: ^/who/mjl/
WebStatic:
StripPrefix: /who/mjl
# Requested path /who/mjl/inferno/ resolves to local web/mjl/inferno.
# If a directory contains an index.html, it is served when a directory is requested.
Root: web/mjl
# With ListFiles true, if a directory does not contain an index.html, the contents are listed.
ListFiles: true
ResponseHeaders:
X-Mox: hi
-
LogName: redir
Domain: www.mox.example
PathRegexp: ^/redir/a/b/c
# Don't redirect from plain HTTP to HTTPS.
DontRedirectPlainHTTP: true
WebRedirect:
# Just change the domain and add query string set fragment. No change to scheme.
# Path will start with /redir/a/b/c (and whathever came after) because no
# OrigPathRegexp+ReplacePath is set.
BaseURL: //moxest.example?q=1#frag
# Default redirection is 308 - Permanent Redirect.
StatusCode: 307
-
LogName: oldnew
Domain: www.mox.example
PathRegexp: ^/old/
WebRedirect:
# Replace path, leaving rest of URL intact.
OrigPathRegexp: ^/old/(.*)
ReplacePath: /new/$1
-
LogName: app
Domain: www.mox.example
PathRegexp: ^/app/
WebForward:
# Strip the path matched by PathRegexp before forwarding the request. So original
# request /app/api become just /api.
StripPath: true
# URL of backend, where requests are forwarded to. The path in the URL is kept,
# so for incoming request URL /app/api, the outgoing request URL has path /app-v2/api.
# Requests are made with Go's net/http DefaultTransporter, including using
# HTTP_PROXY and HTTPS_PROXY environment variables.
URL: http://127.0.0.1:8900/app-v2/
# Add headers to response.
ResponseHeaders:
X-Frame-Options: deny
X-Content-Type-Options: nosniff
`
// Parse just so we know we have the syntax right.
// todo: ideally we would have a complete config file and parse it fully.
var conf struct {
WebDomainRedirects map[string]string
WebHandlers []config.WebHandler
}
err := sconf.Parse(strings.NewReader(webhandlers), &conf)
xcheckf(err, "parsing webhandlers example")
return webhandlers
},
},
}
func cmdExample(c *cmd) {
c.params = "[name]"
c.help = `List available examples, or print a specific example.`
args := c.Parse()
if len(args) > 1 {
c.Usage()
}
var match func() string
for _, ex := range examples {
if len(args) == 0 {
fmt.Println(ex.Name)
} else if args[0] == ex.Name {
match = ex.Get
}
}
if len(args) == 0 {
return
}
if match == nil {
log.Fatalln("not found")
}
fmt.Print(match())
}
func cmdLoglevels(c *cmd) {
c.params = "[level [pkg]]"
c.help = `Print the log levels, or set a new default log level, or a level for the given package.