Repository: gobuffalo/buffalo
Pull request #1522 (2019-01-04 19:24:26)

Fix panic in buffalo info
https://github.com/gobuffalo/meta/commit/0d7e59dd540b2ef77f8dd051c596c8b6f8c660f9 introduced an unexported field to [gobuffalo/meta/app.go](https://github.com/gobuffalo/meta/blob/0d7e59dd540b2ef77f8dd051c596c8b6f8c660f9/app.go#L44), causing a panic in `buffalo info`.

This commit will change the behaviour to ignore inaccessible fields.

markbates: @lukasschlueter can you rebase against `master` so we can get this out in a `0.13` patch?
lukasschlueter: `v0.13.12` is not yet affected (change in `meta` didn't make it there yet).
If we're not planning to add changes (and especially the `meta` update) to the `0.13` versions anymore, I think merging into `development` is the cleaner option as it doesn't involve multiple commits (to master and dev).

But if you prefer, I'll rebase in a few minutes :-)
markbates: Awesome
On Jan 4, 2019, 3:03 PM -0500, Lukas Schlüter <notifications@github.com>, wrote:
> v0.13.12 is not yet affected (change in meta didn't make it there yet).
> If we're not planning to add changes (and especially the meta update) to the 0.13 versions anymore, I think merging into development is the cleaner option as it doesn't involve multiple commits (to master and dev).
> But if you prefer, I'll rebase in a few minutes :-)
> —
> You are receiving this because your review was requested.
> Reply to this email directly, view it on GitHub, or mute the thread.


Patch:
diff --git a/buffalo/cmd/info.go b/buffalo/cmd/info.go
index a2d12610..fea3cd95 100644
--- a/buffalo/cmd/info.go
+++ b/buffalo/cmd/info.go
@@ -31,6 +31,9 @@ var infoCmd = &cobra.Command{
 		var err error
 		for i := 0; i < rt.NumField(); i++ {
 			f := rt.Field(i)
+			if !rv.FieldByName(f.Name).CanInterface() {
+				continue
+			}
 			_, err = bb.WriteString(fmt.Sprintf("%s=%v\n", f.Name, rv.FieldByName(f.Name).Interface()))
 			if err != nil {
 				return err
diff --git a/go.mod b/go.mod
index dcf1dd78..b8ec1184 100644
--- a/go.mod
+++ b/go.mod
@@ -42,7 +42,7 @@ require (
 	github.com/spf13/pflag v1.0.3
 	github.com/spf13/viper v1.3.1
 	github.com/stretchr/testify v1.2.2
-	golang.org/x/crypto v0.0.0-20190102171810-8d7daa0c54b3
+	golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc
 	golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4
 	golang.org/x/tools v0.0.0-20190102213336-ca9055ed7d04
 	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc
diff --git a/go.sum b/go.sum
index 06637b2b..436ecf53 100644
--- a/go.sum
+++ b/go.sum
@@ -1,24 +1,34 @@
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@@ -30,6 +40,7 @@ github.com/gobuffalo/buffalo v0.13.6/go.mod h1:/Pm0MPLusPhWDayjRD+/vKYnelScIiv0s
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@@ -68,6 +79,7 @@ github.com/gobuffalo/envy v1.6.7/go.mod h1:N+GkhhZ/93bGZc6ZKhJLP6+m+tCNPKwgSpH9k
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@@ -78,6 +90,7 @@ github.com/gobuffalo/events v1.1.4/go.mod h1:09/YRRgZHEOts5Isov+g9X2xajxdvOAcUuA
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@@ -85,6 +98,7 @@ github.com/gobuffalo/fizz v1.0.16/go.mod h1:EI3mEpjImuji6Bwu++N2uXhljQwOhwtimZQJ
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@@ -96,6 +110,7 @@ github.com/gobuffalo/flect v0.0.0-20181104133451-1f6e9779237a/go.mod h1:rCiQgmAE
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 github.com/markbates/oncer v0.0.0-20181203154359-bf2de49a0be2/go.mod h1:Ld9puTsIW75CHf65OeIOkyKbteujpZVXDpWK6YGZbxE=
 github.com/markbates/refresh v1.4.10/go.mod h1:NDPHvotuZmTmesXxr95C9bjlw1/0frJwtME2dzcVKhc=
+github.com/markbates/refresh v1.4.11 h1:8F0ri0EOv8WRcxOoDOlcU397nAWq9zTqDhV/vYSbJdo=
 github.com/markbates/refresh v1.4.11/go.mod h1:awpJuyo4zgexB/JaHfmBX0sRdvOjo2dXwIayWIz9i3g=
 github.com/markbates/safe v1.0.0/go.mod h1:nAqgmRi7cY2nqMc92/bSEeQA+R4OheNU2T1kNSCBdG0=
+github.com/markbates/safe v1.0.1 h1:yjZkbvRM6IzKj9tlu/zMJLS0n/V351OZWRnF3QfaUxI=
 github.com/markbates/safe v1.0.1/go.mod h1:nAqgmRi7cY2nqMc92/bSEeQA+R4OheNU2T1kNSCBdG0=
+github.com/markbates/sigtx v1.0.0 h1:y/xtkBvNPRjD4KeEplf4w9rJVSc23/xl+jXYGowTwy0=
 github.com/markbates/sigtx v1.0.0/go.mod h1:QF1Hv6Ic6Ca6W+T+DL0Y/ypborFKyvUY9HmuCD4VeTc=
 github.com/markbates/willie v1.0.9/go.mod h1:fsrFVWl91+gXpx/6dv715j7i11fYPfZ9ZGfH0DQzY7w=
+github.com/mattn/go-colorable v0.0.9 h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
+github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-sqlite3 v1.9.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/mattn/go-sqlite3 v1.10.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00vh2OMYv+xgHpAMF4=
 github.com/microcosm-cc/bluemonday v1.0.2 h1:5lPfLTTAvAbtS0VqT+94yOtFnGfUWYyx0+iToC3Os3s=
 github.com/microcosm-cc/bluemonday v1.0.2/go.mod h1:iVP4YcDBq+n/5fb23BhYFvIMq/leAFZyRl6bYmGDlGc=
+github.com/mitchellh/go-homedir v1.0.0 h1:vKb8ShqSby24Yrqr/yDYkuFz8d0WUjys40rvnGC8aR0=
 github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.0.0/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/monoculum/formam v0.0.0-20180901015400-4e68be1d79ba h1:FEJJhVHSH+Kyxa5qNe/7dprlZbFcj2TG51OWIouhwls=
 github.com/monoculum/formam v0.0.0-20180901015400-4e68be1d79ba/go.mod h1:RKgILGEJq24YyJ2ban8EO0RUVSJlF1pGsEvoLEACr/Q=
 github.com/nicksnyder/go-i18n v1.10.0/go.mod h1:HrK7VCrbOvQoUAQ7Vpy7i87N7JZZZ7R2xBGjv0j365Q=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
@@ -316,12 +376,18 @@ github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+W
 github.com/onsi/gomega v1.4.1/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
 github.com/onsi/gomega v1.4.2/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+github.com/pelletier/go-toml v1.2.0 h1:T5zMGML61Wp+FlcbWjRDT7yAxhJNAiPPLOFECq181zc=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
+github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rogpeppe/go-internal v1.0.0 h1:o4VLZ5jqHE+HahLT6drNtSGTrrUA3wPBmtpgqtdbClo=
 github.com/rogpeppe/go-internal v1.0.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
+github.com/serenize/snaker v0.0.0-20171204205717-a683aaf2d516 h1:ofR1ZdrNSkiWcMsRrubK9tb2/SlZVWttAfqUjJi6QYc=
 github.com/serenize/snaker v0.0.0-20171204205717-a683aaf2d516/go.mod h1:Yow6lPLSAXx2ifx470yD/nUe22Dv5vBvxK/UK9UUTVs=
+github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/shopspring/decimal v0.0.0-20180709203117-cd690d0c9e24/go.mod h1:M+9NzErvs504Cn4c5DxATwIqPbtswREoFCre64PpcG4=
 github.com/shurcooL/go v0.0.0-20180423040247-9e1955d9fb6e/go.mod h1:TDJrrUr11Vxrven61rcy3hJMUqaf/CLWYhHNPmT14Lk=
@@ -333,22 +399,31 @@ github.com/shurcooL/sanitized_anchor_name v0.0.0-20170918181015-86672fcb3f95/go.
 github.com/sirupsen/logrus v1.0.6/go.mod h1:pMByvHTf9Beacp5x1UXfOR9xyW/9antXMhjMPG0dEzc=
 github.com/sirupsen/logrus v1.1.0/go.mod h1:zrgwTnHtNr00buQ1vSptGe8m1f/BbgsPukg8qsT7A+A=
 github.com/sirupsen/logrus v1.1.1/go.mod h1:zrgwTnHtNr00buQ1vSptGe8m1f/BbgsPukg8qsT7A+A=
+github.com/sirupsen/logrus v1.2.0 h1:juTguoYk5qI21pwyTXY3B3Y5cOTH3ZUyZCg1v/mihuo=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
+github.com/sourcegraph/annotate v0.0.0-20160123013949-f4cad6c6324d h1:yKm7XZV6j9Ev6lojP2XaIshpT4ymkqhMeSghO5Ps00E=
 github.com/sourcegraph/annotate v0.0.0-20160123013949-f4cad6c6324d/go.mod h1:UdhH50NIW0fCiwBSr0co2m7BnFLdv4fQTgdqdJTHFeE=
+github.com/sourcegraph/syntaxhighlight v0.0.0-20170531221838-bd320f5d308e h1:qpG93cPwA5f7s/ZPBJnGOYQNK/vKsaDaseuKT5Asee8=
 github.com/sourcegraph/syntaxhighlight v0.0.0-20170531221838-bd320f5d308e/go.mod h1:HuIsMU8RRBOtsCgI77wP899iHVBQpCmg4ErYMZB+2IA=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
 github.com/spf13/afero v1.2.0 h1:O9FblXGxoTc51M+cqr74Bm2Tmt4PvkA5iu/j8HrkNuY=
 github.com/spf13/afero v1.2.0/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
 github.com/spf13/cast v1.2.0/go.mod h1:r2rcYCSwa1IExKTDiTfzaxqT2FNHs8hODu4LnUfgKEg=
+github.com/spf13/cast v1.3.0 h1:oget//CVOEoFewqQxwr0Ej5yjygnqGkvggSE/gB35Q8=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
+github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
+github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9Gc1vn7yk=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/viper v1.2.1/go.mod h1:P4AexN0a+C9tGAnUFNwDMYYZv3pjFuvmeiMyKRaNVlI=
 github.com/spf13/viper v1.3.0/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
+github.com/spf13/viper v1.3.1 h1:5+8j8FTpnFV4nEImW/ofkzEt8VoOiLXxdYIDsB73T38=
 github.com/spf13/viper v1.3.1/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
 github.com/unrolled/secure v0.0.0-20180918153822-f340ee86eb8b/go.mod h1:mnPT77IAdsi/kV7+Es7y+pXALeV3h7G6dQF6mNYjcLA=
@@ -370,6 +445,8 @@ golang.org/x/crypto v0.0.0-20181127143415-eb0de9b17e85/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190102171810-8d7daa0c54b3 h1:35ZwriXqdZtBGoFgUpW71Z7xz5o23fRpWHFAO2PlnIA=
 golang.org/x/crypto v0.0.0-20190102171810-8d7daa0c54b3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc h1:F5tKCVGp+MUAHhKp5MZtGqAlGX3+oCsiL1Q629FL90M=
+golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180816102801-aaf60122140d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -391,6 +468,7 @@ golang.org/x/net v0.0.0-20181220203305-927f97764cc3 h1:eH6Eip3UpmR+yM/qI9Ijluzb1
 golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180816055513-1c9583448a9c/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -418,6 +496,7 @@ golang.org/x/sys v0.0.0-20181213200352-4d1cda033e06/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181221143128-b4a75ba826a6/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190102155601-82a175fd1598 h1:S8GOgffXV1X3fpVG442QRfWOt0iFl79eHJ7OPt725bo=
 golang.org/x/sys v0.0.0-20190102155601-82a175fd1598/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181003024731-2f84ea8ef872/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -466,4 +545,5 @@ gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df/go.mod h1:LRQQ+SO6ZHR7tOkp
 gopkg.in/mail.v2 v2.0.0-20180731213649-a0242b2233b4/go.mod h1:htwXN1Qh09vZJ1NVKxQqHPBaCBbzKhp5GzuJEA4VJWw=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/route_mappings.go b/route_mappings.go
index 340305f5..17e4f223 100644
--- a/route_mappings.go
+++ b/route_mappings.go
@@ -10,10 +10,16 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/gobuffalo/envy"
 	"github.com/markbates/inflect"
 	"github.com/pkg/errors"
 )
 
+const (
+	// AssetsAgeVarName is the ENV variable used to specify max age when ServeFiles is used.
+	AssetsAgeVarName = "ASSETS_MAX_AGE"
+)
+
 // GET maps an HTTP "GET" request to the path and the specified handler.
 func (a *App) GET(p string, h Handler) *RouteInfo {
 	return a.addRoute("GET", p, h)
@@ -94,12 +100,17 @@ func (a *App) ServeFiles(p string, root http.FileSystem) {
 func (a *App) fileServer(fs http.FileSystem) http.Handler {
 	fsh := http.FileServer(fs)
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		_, err := fs.Open(path.Clean(r.URL.Path))
+		f, err := fs.Open(path.Clean(r.URL.Path))
 		if os.IsNotExist(err) {
 			eh := a.ErrorHandlers.Get(404)
 			eh(404, errors.Errorf("could not find %s", r.URL.Path), a.newContext(RouteInfo{}, w, r))
 			return
 		}
+
+		stat, _ := f.Stat()
+		maxAge := envy.Get(AssetsAgeVarName, "31536000")
+		w.Header().Add("ETag", fmt.Sprintf("%x", stat.ModTime()))
+		w.Header().Add("Cache-Control", fmt.Sprintf("max-age=%s", maxAge))
 		fsh.ServeHTTP(w, r)
 	})
 }


Test patch:
diff --git a/router_test.go b/router_test.go
index 834d53fb..0489ae73 100644
--- a/router_test.go
+++ b/router_test.go
@@ -9,6 +9,7 @@ import (
 	"testing"
 
 	"github.com/gobuffalo/buffalo/render"
+	"github.com/gobuffalo/envy"
 	"github.com/gobuffalo/httptest"
 	"github.com/gobuffalo/packd"
 	"github.com/gobuffalo/packr/v2"
@@ -342,6 +343,19 @@ func Test_Router_ServeFiles(t *testing.T) {
 
 	r.Equal(200, res.Code)
 	r.Equal("foo", res.Body.String())
+
+	r.NotEqual(res.Header().Get("ETag"), "")
+	r.Equal(res.Header().Get("Cache-Control"), "max-age=31536000")
+
+	envy.Set(AssetsAgeVarName, "3600")
+	w = httptest.New(a)
+	res = w.HTML("/assets/foo.png").Get()
+
+	r.Equal(200, res.Code)
+	r.Equal("foo", res.Body.String())
+
+	r.NotEqual(res.Header().Get("ETag"), "")
+	r.Equal(res.Header().Get("Cache-Control"), "max-age=3600")
 }
 
 func Test_App_NamedRoutes(t *testing.T) {