Initial Commit

.gitignore

@@ -0,0 +1,17 @@
+# Goland (developer-specific stuff)
+.idea/workspace.xml
+
+# Custom certificates
+*.pem
+!cert1.pem
+!cert2.pem
+!key1.pem
+!key2.pem
+*.der
+!cert1.der
+!cert2.der
+!key1.der
+!key2.der
+
+# Sample JSON configs
+*.json

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# Contributing to the ZapSmtp
+Contributions to the ZapSmtp are always welcome. 
+
+This document explains the general requirements for contributions and the necessary preparation steps. 
+It also sketches the typical integration process of patches.
+
+All contributions are subject to verification. Complex changes or changes with opaque impact may be rejected.
+
+## 1) Contribution Checklist
+- Use git to manage your changes [**recommended**]
+- Readability and code style over code efficiency [**required**]
+- Provide well-tested low maintenance code [**required**]
+- Provide code that is secure by default and can run out-of-the-box [**required**]
+- Add the required copyright header to each new file introduced, see [**required**]
+  [licensing information](./LICENSE) [**required**]
+- Structure patches logically, in small steps [**required**]
+- All code turns into future liability, do not let the feature creep get hold of you! [**required**]
+
+## 2) By contributing, you certify, that:
+
+    (a) The contribution was created in whole or in part by you and you
+        have the right to submit it under the open source license
+        indicated by this project; or
+
+    (b) The contribution was provided directly to you by some other
+        person who certified (a) or (b) and you have not modified
+        it.
+
+    (c) You understand and agree that this project and the contribution
+        are public and that a record of the contribution (including all
+        personal information you submit with it) is maintained indefinitely 
+        and may be redistributed consistent with this project or the 
+        open source license(s) involved.

LICENSE

@@ -0,0 +1,16 @@
+Copyright 2021 Siemens AG
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+and associated documentation files (the "Software"), to deal in the Software without restriction, 
+including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or 
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,82 @@
+# ZapSmtp
+Let's be real, who's regularly browsing through megabytes of log files? Wouldn't it be nice, if important messages 
+were delivered to you in time, and the log files just served the purpose of holding the details?
+
+This package offers extended functionality for the [zap logger](https://github.com/uber-go/zap), with the purpose 
+of handling (some) log messages via (optionally signed and/or encrypted) SMTP mails. 
+
+We use this package to notice critical issues fast, so we can roll out a fix, before the user pushes the same buttons 
+again. Yes, yes, alternatively, you can expand the turbine stack of your production environment
+by deploying, configuring and maintaining additional log management software.
+
+### Installation
+As Golang only supports plain text SMTP mails natively, _OpenSSL_ has to be installed if encryption and/or signature is
+to be enabled. Other than that a simple `go get` is sufficient.
+
+### Usage
+Because sending out a new mail for every single log message is not desirable in most cases, it is recommended to use
+some kind of buffered Core. For this the `delayedCore` provided in this package can be used.
+
+```go
+func Exmaple() {
+
+    // Prepare SMTP sink
+    sink, errSink := smtp.NewWriteSyncCloser(
+        conf.Server,
+        conf.Port,
+        conf.Subject,
+        conf.Sender,              // mail.Address structs for the sender
+        conf.Recipients,          // mail.Address structs for each recipient
+        conf.OpensslPath,         // Can be omitted, if no e-mail signature nor encryption is desired
+        conf.SignatureCertPath,   // Can be omitted, if no e-mail signature is desired
+        conf.SignatureKeyPath,    // Can be omitted, if no e-mail signature is desired
+        conf.EncryptionCertPaths, // Can be omitted, if no e-mail encryption is desired
+        conf.TempDir,             // If empty, the system's temporary directory will be used if needed
+    )
+    if errSink != nil {
+        fmt.Printf("Initializing SMTP sink failed: %s\n", errSink)
+        return
+    }
+
+    // Make sure logger is closed properly
+    defer func() {
+        if errClose := sink.Close(); errClose != nil {
+            fmt.Printf("Closing SMTP sink failed: %s\n", errClose)
+        }
+    }()
+
+    // Define the encoder
+    enc := zapcore.NewConsoleEncoder(zap.NewDevelopmentEncoderConfig())
+
+    // Initialize SMTP core
+    core, errCore := cores.NewDelayedCore(zapcore.WarnLevel, enc, sink, zapcore.ErrorLevel, time.Minute*1, time.Second*5)
+    if errCore != nil {
+        fmt.Printf("Initializing SMTP core failed: %s\n", errCore)
+        return
+    }
+
+    // Initialize Zap logger
+    logger := zap.New(core)
+
+    // Make sure logger is flushed before shutting down
+    defer func() { _ = logger.Sync() }()
+
+    // Log stuff
+    logger.Warn("Warn message, triggering email after 1 minute")
+    logger.Error("Error message, triggering email after 5 seconds") // Email sent after 5 seconds will include warning
+}
+```
+
+Note that even though the `writeSyncCloser` satisfies zap's `Sink` interface it is not recommended using it with
+`RegisterSink` as this way only standard `ioCores` can be used.
+
+Another example can be found in `./examples`. 
+You can also visit [Large-Scale Discovery](https://github.com/siemens/large-scale-discovery) to see it applied.
+
+### Best practices
+- When possible the `writeSyncCloser` should be preferred over the `writeSyncer`, as it will convert files only once and
+  keep a reference to the resulting files until `Close` is called.
+- As encrypting and signing mails via _OpenSSL_ is slow it is recommended to not log too frequently. This depends
+  heavily on your use case though.
+- Email signature and encryption needs certificate and key files in PEM format. The `writeSyncer` (and `writeSyncCloser`)
+  also allows for DER format and will convert them internally. It's advised though to use PEM format if possible.

_test/cert1.pem

@@ -0,0 +1,35 @@
+-----BEGIN CERTIFICATE-----
+MIIGGTCCBAGgAwIBAgIUPfNTpjvRDWefFLbC9Uxo2rdQ9vwwDQYJKoZIhvcNAQEL
+BQAwgZsxCzAJBgNVBAYTAlVTMRQwEgYDVQQIDAt6YXAtdGVzdGluZzEUMBIGA1UE
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+VuLs//nn/aFmOvKkTlVsSkDgBgWt0LlvhXnlu84=
+-----END CERTIFICATE-----

_test/cert2.pem

@@ -0,0 +1,35 @@
+-----BEGIN CERTIFICATE-----
+MIIGJTCCBA2gAwIBAgIUUwMKLnzEwP3yv2sXWb8a9hwz/5UwDQYJKoZIhvcNAQEL
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+Mb2ixWmTTPrjn+gNyGrU1BkJglsaZGmjYyv/VsdP7RCT7XDnach5HR8=
+-----END CERTIFICATE-----

_test/gen.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+openssl req -newkey rsa:4096 -nodes -keyout key.pem -x509 -days 3650 -outform pem -out cert.pem

_test/key1.pem

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJRAIBADANBgkqhkiG9w0BAQEFAASCCS4wggkqAgEAAoICAQDpCul1Q5wh3CIe
+xpNSTb/l8b6v+ccnha4NsbrPvxiktPBjbskt3CfauMayw/XRBCIbVQjAkdsj64sQ
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+eQh4ZC4L0syzmMjb0mOdfEhj1NpV7ic1
+-----END PRIVATE KEY-----

_test/key2.pem

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----