create template processor

go.mod

@@ -25,6 +25,7 @@ require (
 	github.com/Jeffail/gabs/v2 v2.7.0
 	github.com/Jeffail/grok v1.1.0
 	github.com/Jeffail/shutdown v1.0.0
+	github.com/Masterminds/sprig/v3 v3.3.0
 	github.com/Masterminds/squirrel v1.5.4
 	github.com/OneOfOne/xxhash v1.2.8
 	github.com/PaesslerAG/gval v1.2.3
@@ -175,7 +176,9 @@ require (
 	cloud.google.com/go/pubsub/v2 v2.0.0 // indirect
 	github.com/BurntSushi/toml v1.5.0 // indirect
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.54.0 // indirect
-	github.com/apache/arrow-go/v18 v18.5.2 // indirect
+	github.com/Masterminds/goutils v1.1.1 // indirect
+	github.com/Masterminds/semver/v3 v3.3.0 // indirect
+	github.com/apache/arrow-go/v18 v18.5.1 // indirect
 	github.com/apache/thrift v0.22.0 // indirect
 	github.com/aws/aws-sdk-go-v2/service/signin v1.0.1 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
@@ -208,16 +211,20 @@ require (
 	github.com/google/btree v1.1.3 // indirect
 	github.com/google/gnostic-models v0.7.0 // indirect
 	github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c // indirect
-	github.com/hamba/avro/v2 v2.31.0 // indirect
+	github.com/hamba/avro/v2 v2.30.0 // indirect
+	github.com/huandu/xstrings v1.5.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/asmfmt v1.3.2 // indirect
 	github.com/minio/asm2plan9s v0.0.0-20200509001527-cdd76441f9d8 // indirect
 	github.com/minio/c2goasm v0.0.0-20190812172519-36a3d3bbc4f3 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/spf13/cast v1.7.0 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
 	github.com/spiffe/go-spiffe/v2 v2.6.0 // indirect
 	github.com/theparanoids/crypki v1.20.9 // indirect
@@ -258,7 +265,7 @@ require (
 	cloud.google.com/go/monitoring v1.24.3 // indirect
 	cloud.google.com/go/spanner v1.86.1
 	cloud.google.com/go/trace v1.11.7 // indirect
-	dario.cat/mergo v1.0.0 // indirect
+	dario.cat/mergo v1.0.1 // indirect
 	github.com/99designs/go-keychain v0.0.0-20191008050251-8e49817e8af4 // indirect
 	github.com/99designs/keyring v1.2.2 // indirect
 	github.com/AthenZ/athenz v1.12.30 // indirect
@@ -407,7 +414,7 @@ require (
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/schollz/progressbar/v2 v2.15.0 // indirect
 	github.com/segmentio/asm v1.2.0 // indirect
-	github.com/shopspring/decimal v1.3.1 // indirect
+	github.com/shopspring/decimal v1.4.0 // indirect
 	github.com/slack-go/slack v0.17.3
 	github.com/snowplow/snowplow-golang-analytics-sdk v0.4.0
 	github.com/spaolacci/murmur3 v1.1.0 // indirect

go.sum

@@ -638,8 +638,8 @@ cuelabs.dev/go/oci/ociregistry v0.0.0-20231103182354-93e78c079a13 h1:zkiIe8AxZ/k
 cuelabs.dev/go/oci/ociregistry v0.0.0-20231103182354-93e78c079a13/go.mod h1:XGKYSMtsJWfqQYPwq51ZygxAPqpEUj/9bdg16iDPTAA=
 cuelang.org/go v0.7.1 h1:wSuUSIKR9M1yrph57l8EJATWVRWHaq/Zd0dFUL10PC8=
 cuelang.org/go v0.7.1/go.mod h1:ix+3dM/bSpdG9xg6qpCgnJnpeLtciZu+O/rDbywoMII=
-dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
-dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+dario.cat/mergo v1.0.1 h1:Ra4+bf83h2ztPIQYNP99R6m+Y7KfnARDfID+a+vLl4s=
+dario.cat/mergo v1.0.1/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
 git.sr.ht/~sbinet/gg v0.3.1/go.mod h1:KGYtlADtqsqANL9ueOFkWymvzUvLMQllU5Ixo+8v3pc=
@@ -719,9 +719,13 @@ github.com/Jeffail/grok v1.1.0/go.mod h1:dm0hLksrDwOMa6To7ORXCuLbuNtASIZTfYheavL
 github.com/Jeffail/shutdown v1.0.0 h1:afYjnY4pksqP/012m3NGJVccDI+WATdSzIMVHZKU8/Y=
 github.com/Jeffail/shutdown v1.0.0/go.mod h1:5dT4Y1oe60SJELCkmAB1pr9uQyHBhh6cwDLQTfmuO5U=
 github.com/JohnCGriffin/overflow v0.0.0-20211019200055-46fa312c352c/go.mod h1:X0CRv0ky0k6m906ixxpzmDRLvX58TFUKS2eePweuyxk=
+github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJLSYI=
+github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
-github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
-github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
+github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
+github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
+github.com/Masterminds/sprig/v3 v3.3.0 h1:mQh0Yrg1XPo6vjYXgtf5OtijNAKJRNcTdOOGZe3tPhs=
+github.com/Masterminds/sprig/v3 v3.3.0/go.mod h1:Zy1iXRYNqNLUolqCpL4uhk6SHUMAOSCzdgBfDb35Lz0=
 github.com/Masterminds/squirrel v1.5.4 h1:uUcX/aBc8O7Fg9kaISIUsHXdKuqehiXAMQTYX8afzqM=
 github.com/Masterminds/squirrel v1.5.4/go.mod h1:NNaOrjSoIDfDA40n7sr2tPNZRfjzjA400rg+riTZj10=
 github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
@@ -751,8 +755,8 @@ github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHG
 github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwToPjQ=
 github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-github.com/apache/arrow-go/v18 v18.5.2 h1:3uoHjoaEie5eVsxx/Bt64hKwZx4STb+beAkqKOlq/lY=
-github.com/apache/arrow-go/v18 v18.5.2/go.mod h1:yNoizNTT4peTciJ7V01d2EgOkE1d0fQ1vZcFOsVtFsw=
+github.com/apache/arrow-go/v18 v18.5.1 h1:yaQ6zxMGgf9YCYw4/oaeOU3AULySDlAYDOcnr4LdHdI=
+github.com/apache/arrow-go/v18 v18.5.1/go.mod h1:OCCJsmdq8AsRm8FkBSSmYTwL/s4zHW9CqxeBxEytkNE=
 github.com/apache/arrow/go/v10 v10.0.1/go.mod h1:YvhnlEePVnBS4+0z3fhPfUy7W1Ikj0Ih0vcRo/gZ1M0=
 github.com/apache/arrow/go/v11 v11.0.0/go.mod h1:Eg5OsL5H+e299f7u5ssuXsuHQVEGC4xei5aX110hRiI=
 github.com/apache/arrow/go/v15 v15.0.2 h1:60IliRbiyTWCWjERBCkO1W4Qun9svcYoZrSLcyOsMLE=
@@ -1084,6 +1088,8 @@ github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/
 github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
 github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
+github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
 github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
 github.com/fxamacker/cbor/v2 v2.9.0 h1:NpKPmjDBgUfBms6tr6JZkTHtfFGcMKsw3eGcmD/sapM=
@@ -1349,8 +1355,8 @@ github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c h1:6rhixN/i8
 github.com/gsterjov/go-libsecret v0.0.0-20161001094733-a6f4afe4910c/go.mod h1:NMPJylDgVpX0MLRlPy15sqSwOFv/U1GZ2m21JhFfek0=
 github.com/hailocab/go-hostpool v0.0.0-20160125115350-e80d13ce29ed h1:5upAirOpQc1Q53c0bnx2ufif5kANL7bfZWcc6VJWJd8=
 github.com/hailocab/go-hostpool v0.0.0-20160125115350-e80d13ce29ed/go.mod h1:tMWxXQ9wFIaZeTI9F+hmhFiGpFmhOHzyShyFUhRm0H4=
-github.com/hamba/avro/v2 v2.31.0 h1:wv3nmua7lCEIwWsb6vqsTS3pXktTxcKg5eoyNu0VhrU=
-github.com/hamba/avro/v2 v2.31.0/go.mod h1:t6lJYAGE5Mswfn17zjtyQsssRQgnqO6TXLBCHHWRqrw=
+github.com/hamba/avro/v2 v2.30.0 h1:OaIdh0+dZIJ331FO/+YYBwZZRdGVyyHuRSyHsjZLJoA=
+github.com/hamba/avro/v2 v2.30.0/go.mod h1:X6gDhYv6DQVAT56VqOKuW+PLnQrEQqGB9l1nhlMdAdQ=
 github.com/hashicorp/go-cleanhttp v0.5.0/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
 github.com/hashicorp/go-hclog v0.9.1/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
 github.com/hashicorp/go-hclog v1.1.0 h1:QsGcniKx5/LuX2eYoeL+Np3UKYPNaN7YKpTh29h8rbw=
@@ -1378,6 +1384,8 @@ github.com/hashicorp/raft v1.3.9 h1:9yuo1aR0bFTr1cw7pj3S2Bk6MhJCsnr2NAxvIBrP2x4=
 github.com/hashicorp/raft v1.3.9/go.mod h1:4Ak7FSPnuvmb0GV6vgIAJ4vYT4bek9bb6Q+7HVbyzqM=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
 github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
+github.com/huandu/xstrings v1.5.0 h1:2ag3IFq9ZDANvthTwTiqSSZLjDc+BedvHPAp5tJy2TI=
+github.com/huandu/xstrings v1.5.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/iancoleman/strcase v0.2.0/go.mod h1:iwCmte+B7n89clKwxIoIXy/HfoL7AsD47ZCWhYzw7ho=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
@@ -1569,10 +1577,14 @@ github.com/minio/highwayhash v1.0.2 h1:Aak5U0nElisjDCfPSG79Tgzkn2gl66NxOMspRrKnA
 github.com/minio/highwayhash v1.0.2/go.mod h1:BQskDq+xkJ12lmlUUi7U0M5Swg3EWR+dLTk+kldvVxY=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
+github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
+github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
 github.com/mitchellh/go-wordwrap v1.0.1 h1:TLuKupo69TCn6TQSyGxwI1EblZZEsQ0vMlAFQflz0v0=
 github.com/mitchellh/go-wordwrap v1.0.1/go.mod h1:R62XHJLzvMFRBbcrT7m7WgmE1eOyTSsCt+hzestvNj0=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
+github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
 github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3Nl2EsFP0=
 github.com/moby/docker-image-spec v1.3.1/go.mod h1:eKmb5VW8vQEh/BAr2yvVNvuiJuY6UIocYsFu/DxxRpo=
 github.com/moby/patternmatcher v0.6.0 h1:GmP9lR19aU5GqSSFko+5pRqHi+Ohk1O69aFiKkVGiPk=
@@ -1787,8 +1799,9 @@ github.com/shoenig/go-m1cpu v0.1.6 h1:nxdKQNcEB6vzgA2E2bvzKIYRuNj7XNJ4S/aRSwKzFt
 github.com/shoenig/go-m1cpu v0.1.6/go.mod h1:1JJMcUBvfNwpq05QDQVAnx3gUHr9IYF7GNg9SUEw2VQ=
 github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4=
 github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
-github.com/shopspring/decimal v1.3.1 h1:2Usl1nmF/WZucqkFZhnfFYxxxu8LG21F6nPQBE5gKV8=
 github.com/shopspring/decimal v1.3.1/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
+github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
+github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
 github.com/sijms/go-ora/v2 v2.8.22 h1:3ABgRzVKxS439cEgSLjFKutIwOyhnyi4oOSBywEdOlU=
 github.com/sijms/go-ora/v2 v2.8.22/go.mod h1:QgFInVi3ZWyqAiJwzBQA+nbKYKH77tdp1PYoCqhR2dU=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
@@ -1813,6 +1826,8 @@ github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2
 github.com/spf13/afero v1.3.3/go.mod h1:5KUK8ByomD5Ti5Artl0RtHeI5pTF7MIDuXL3yY520V4=
 github.com/spf13/afero v1.6.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
 github.com/spf13/afero v1.9.2/go.mod h1:iUV7ddyEEZPO5gA3zD4fJt6iStLlL+Lg4m2cihcDf8Y=
+github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
+github.com/spf13/cast v1.7.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
 github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
 github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spiffe/go-spiffe/v2 v2.6.0 h1:l+DolpxNWYgruGQVV0xsfeya3CsC7m8iBzDnMpsbLuo=
@@ -2454,8 +2469,8 @@ gonum.org/v1/gonum v0.0.0-20180816165407-929014505bf4/go.mod h1:Y+Yx5eoAFn32cQvJ
 gonum.org/v1/gonum v0.8.2/go.mod h1:oe/vMfY3deqTw+1EZJhuvEW2iwGF1bW9wwu7XCu0+v0=
 gonum.org/v1/gonum v0.9.3/go.mod h1:TZumC3NeyVQskjXqmyWt4S3bINhy7B4eYwW69EbyX+0=
 gonum.org/v1/gonum v0.11.0/go.mod h1:fSG4YDCxxUZQJ7rKsQrj0gMOg00Il0Z96/qMA4bVQhA=
-gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
-gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
+gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
+gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
 gonum.org/v1/netlib v0.0.0-20190313105609-8cb42192e0e0/go.mod h1:wa6Ws7BG/ESfp6dHfk7C6KdzKA7wR7u/rKwOGE66zvw=
 gonum.org/v1/plot v0.0.0-20190515093506-e2840ee46a6b/go.mod h1:Wt8AAjI+ypCyYX3nZBvf6cAIx93T+c/OS2HFAYskSZc=
 gonum.org/v1/plot v0.9.0/go.mod h1:3Pcqqmp6RHvJI72kgb8fThyUnav364FOsdDo2aGW5lY=

internal/impl/pure/processor_template.go

@@ -0,0 +1,125 @@
+package pure
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"text/template"
+
+	"github.com/Masterminds/sprig/v3"
+	"github.com/warpstreamlabs/bento/public/bloblang"
+	"github.com/warpstreamlabs/bento/public/service"
+)
+
+const (
+	tpFieldText      = "text"
+	tpFieldFunctions = "functions"
+)
+
+func TemplateProcessorSpec() *service.ConfigSpec {
+	return service.NewConfigSpec().
+		Categories("Mapping").
+		Beta().
+		Summary("Transforms messages using Go template syntax.").
+		Description(`Transforms messages using Go template syntax.
+Supports built-in Go template functions,
+Sprig template functions (including string manipulation, math, date, and encoding utilities)
+and a custom `+"`"+`meta`+"`"+` function to access message metadata (e.g., `+"`"+`{{ meta \"key\" }}`+"`"+`).
+Additionally, users can define custom Bloblang-based functions via the `+"`"+`functions`+"`"+` field, which are available during template execution.`).
+		Fields(
+			service.NewStringField(tpFieldText).
+				Description("The Go template to apply to messages.").
+				Example("{{ .name }} - {{ meta \"source\" }}").
+				Example("{{ range .items }}{{ .name }}: {{ .value }}{{ end }}").
+				Default("{{ . }}"),
+			service.NewStringMapField(tpFieldFunctions).
+				Description("A map of Bloblang functions to make available to the template.").
+				Optional(),
+		)
+}
+
+func init() {
+	err := service.RegisterProcessor("template", TemplateProcessorSpec(), NewTemplateProcessorFromConfig)
+	if err != nil {
+		panic(err)
+	}
+}
+
+type templateProc struct {
+	tmpl *template.Template
+}
+
+func NewTemplateProcessorFromConfig(conf *service.ParsedConfig, mgr *service.Resources) (service.Processor, error) {
+	templateStr, err := conf.FieldString(tpFieldText)
+	if err != nil {
+		return nil, err
+	}
+
+	var functions template.FuncMap
+
+	if conf.Contains(tpFieldFunctions) {
+		functionsMap, err := conf.FieldStringMap(tpFieldFunctions)
+		if err != nil {
+			return nil, err
+		}
+
+		functions = make(template.FuncMap, len(functionsMap)+1)
+		for name, fn := range functionsMap {
+			blob, err := bloblang.Parse(fn)
+			if err != nil {
+				return nil, err
+			}
+			if name == "meta" {
+				return nil, errors.New("can not define a function named meta")
+			}
+			functions[name] = func(msg any) (any, error) {
+				return blob.Query(msg)
+			}
+		}
+		functions["meta"] = func(name string) any {
+			return nil
+		}
+	} else {
+		functions = template.FuncMap{
+			"meta": func(name string) any {
+				return nil
+			},
+		}
+	}
+
+	tmpl, err := template.New("template").Funcs(functions).Funcs(sprig.TxtFuncMap()).Parse(templateStr)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to parse template: %w", err)
+	}
+
+	return &templateProc{
+		tmpl: tmpl,
+	}, nil
+}
+
+func (t *templateProc) Process(ctx context.Context, msg *service.Message) (service.MessageBatch, error) {
+	obj, err := msg.AsStructured()
+	if err != nil {
+		return nil, fmt.Errorf("Failed to parse part into json: %v", err)
+	}
+
+	var buf bytes.Buffer
+	if err := t.tmpl.Funcs(template.FuncMap{
+		"meta": func(name string) any {
+			if val, exists := msg.MetaGetMut(name); exists {
+				return val
+			}
+			return nil
+		},
+	}).Execute(&buf, obj); err != nil {
+		return nil, fmt.Errorf("Failed to execute template: %v", err)
+	}
+
+	msg.SetBytes(buf.Bytes())
+	return service.MessageBatch{msg}, nil
+}
+
+func (t *templateProc) Close(context.Context) error {
+	return nil
+}