goeland

An RSS to email, à la rss2email, written in Go.

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About

Goeland excels at creating beautiful emails from RSS feeds, tailored for daily or weekly digest.

It includes a number of filters (see below) that can transform the RSS content along the way. It can also consume other sources, such as Imgur tags.

Goeland transforms this...

<rss version="2.0">
<channel>
<title>Phoronix</title>
<link>https://www.phoronix.com/</link>
<description>
Linux Hardware Reviews, Benchmarks & Open-Source News
</description>
<language>en-us</language>
<item>
<title>
Google Announces KataOS As Security-Focused OS, Leveraging Rust & seL4 Microkernel
</title>
<link>https://www.phoronix.com/news/Google-KataOS</link>
<guid>https://www.phoronix.com/news/Google-KataOS</guid>
<description>
Google this week has announced the release of KataOS as their newest operating system effort focused on embedded devices running ambient machine learning workloads. KataOS is security-minded, exclusively uses the Rust programming language, and is built atop the seL4 microkernel as its foundation...
</description>
<pubDate>Sun, 16 Oct 2022 06:10:25 -0400</pubDate>
</item>
</rss>

into this

Goeland has a size-fits-all default template that works well with mobile, tablet, desktop and webmail clients.

Goeland can extract full text from most article sources, enabling a ready to consume email.

Status

Goeland is used in production with many email clients, and has sent over thousands of emails. It is considered stable.

Installation

Grab the latest binary release from the release page. Binaries are available for the following platforms:

linux/386
linux/amd64
linux/arm
linux/arm64
darwin/amd64
windows/amd64
windows/386

Just put it in a folder where you have write permissions and run it first with :

goeland run

If you are interested for another platform to be supported, please open a PR or submit a feature request.

Usage

On first run, if it doesn't exist yet, goeland will create a config.toml with the default values. You need to adjust the [email] section with your SMTP server details. The config values can also be set with environment variables (e.g. GOELAND_EMAIL_PASSWORD_FILE=/path/to/pass).

Sources

Afterwards, fill the [sources] and [pipes] sections. Source are identified by their name after the [source.] field:

[sources.hackernews]
type = "feed"
url = "https://hnrss.org/newest"
filters = ["all", "today"]

You can then use 'hackernews' in the following pipes.

The different source types are:

"feed": RSS, Atom or JSON feed (all supported formats can be found here). Fill in the url field.
"imgur": Return most recent results for a tag. Fill in the the tag field.
"merge": Will merge two or more sources together. Fill in the sources field with a list of sources: sources = ["source1", "source2"]. Especially useful to merge different sources on the same topic. Don't forget to digest or combine it later.

Filtering

One powerful aspect of goeland is filtering. Instead of sending the content of the RSS directly to the email system, it can transform it in a number of ways in order to make it easier to read, process, etc.

Any number of filters can be defined, the order is important. For example, the following:

filters = ["unseen", "retrieve", "digest"]

Will first keep only previously unseen entries, then make it nicer with the retrieve filter, and, at last, will put them all together with digest. This will create only one email with a SourceTitle as the title of the RSS feed.

Filters can have options. For example, to get the 3 newest post, you would do:

filters = ["first(3)"]

The available filters are as follows:

none: Removes all entries
all: Default, include all entries
first: Keep only the first (usually newest) entries (default 1)
last: Keep only the last (usually oldest) entries (default 1)
reverse: Reverse the order of the entries
random: Keep 1 or more random entries (default 5)
unseen: Keep only unseen entry. Entries that have been seen will be put in a goeland.db file. Use the purge command to remove seen entries
today: Keep only the entries of the day
lasthours: Keep only the entries that are from the X last hours (default 24)
digest: Make a digest of all entries (optional heading level, default 2)
combine: Combine all the entries into one source and use the first entry title as source title. Useful for merged sources
links: Rewrite relative links src="https://github.com// and href="https://github.com// to have an https:// prefix
embedimage: Embed a picture if the entry has an attachment with a type of picture (optional position: top|bottom|left|right, default top)
replace: Replace a string with another. Use with an argument like this: replace(myreplace) and define

[replace.myreplace]
        from="A string"
        to="Another string"

in your config file.

includelink: Include the link of entries in the digest form
retrieve: Retrieves the full content from a goquery. E.g. you can use retrieve(div.content) to get the full excerpts of Next INpact's LeBrief
language: Keep only the specified languages (best effort detection), use like this: language(en,de)
untrack: Removes feedburner pixel tracking
reddit: Better formatting for reddit rss
sanitize: Sanitize the content of entries (to be used if --unsafe-no-sanitize-filter was passed)
toc: Create a special table of content entry containing the titles of all entries. Use toc(title) to use the Title as a link
limitwords: Limit the number of words in the entry, use like this: limitwords(32)

Pipes

After defining some sources, you can send them to a pipe. One source can be sent to multiple pipes, but a pipe can only have one source. If you need to combine sources together, use the above special merge.

A pipe has the following structure:

[pipes.hackernews]
source = "hackernews"
destination = "email"
email_to = "[email protected]"
email_from = "HackerNews <[email protected]>"
email_title = "{{.EntryTitle}}"
template = "/path/to/template.html" # optional

You can use EntryTitle, SourceTitle and SourceName in the email template. SourceTitle is the title of the RSS feed.

For debugging purposes, or in order to pipe to other systems, you can set the destination to terminal.

Email

In the email section you need to specify your outgoing mail server. You can specify both encryption and allow-insecure to connect to self-hosted servers. You can also specify authentication to select the appropriate option for your server (the options available are "none", "plain", "login" and "crammd5"; if unspecified it defaults to "plain"; see go-simple-mail's documentation for details).

[email]
host = "smtp.example.com"
port = 25
username = "default"
password = "p4ssw0rd"
# password_file = /run/password/goeland_smtp_pass
encryption = "tls"
allow-insecure = false
authentication = "plain"
#Email customization
include-header = true
include-footer = true
#footer = Your custom footer
#logo = internal:goeland.png
#template = /path/to/template.html

You can create your own template, see relevant documentation. The pipe template takes precedence over the main template defined in the [email] section.

Examples

This will bring you 6 puppies to your inbox.

loglevel = "info"
dry-run = false

[email]
host = "smtp.sendgrid.net"
port = 587
username = "apikey"
password = "<sendgridapikey>"

[sources]

[sources.insta]
url = "https://rssbridge.example.com/?action=display&bridge=Instagram&context=Hashtag&h=puppy&media_type=picture&direct_links=on&format=MRss"
type = "feed"
filters = ["random(3)"]

[sources.imgur]
type = "imgur"
tag = "puppy"
filters = ["random(3)"]

[sources.puppies]
type = "merge"
sources = ["insta", "imgur"]
filters = ["combine"]

[pipes]

[pipes.puppies]
source = "puppies"
destination = "email"
email_to = ["[email protected]"]
email_from = "DailyPuppy <[email protected]>"

This will give you the latest article on a specific subreddit:

loglevel = "none"
dry-run = false
database = "goeland.db"

[email]
host = "example.com"
port = 25
username = "username"
password = "password"

[sources]

[sources.reddit]
url = "https://www.reddit.com/r/selfhosted/top.rss"
type = "feed"
filters = ["unseen", "includelink", "digest"]

[pipes.reddit]
source = "reddit"
destination = "email"
email_to = ["[email protected]"]
email_from = "Reddit <[email protected]>"

It is possible to send an email to multiple addresses, just put them in a list:

[pipes.reddit]
source = "reddit"
destination = "email"
email_to = ["[email protected]", "[email protected]", "[email protected]"]
email_from = "Reddit <[email protected]>"

Contributing

Feel free to open issues or PR for bugs and suggestions for more filters and source types.

If you encounter a problematic feed, please open an issue with the content of the feed attached.

Future

Here is a list of things that could be nice

image inliner
embedded scripting language for filters&manipulation
remove tags for instagram
footer text
use enclosure of the feed as header image
https://github.com/go-shiori/go-readability

Cheap and reliable Node.js hosting starts at $3/month, and $1/month static HTML hosting

slurdge / goeland

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