wip ovpn refactor

Cargo.lock

@@ -145,12 +145,37 @@ version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "bstr"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40723b8fb387abc38f4f4a37c09073622e41dd12327033091ef8950659e6dc0c"
+dependencies = [
+ "memchr",
+ "serde",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "bytes"
 version = "1.8.0"
@@ -186,6 +211,28 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "chrono-tz"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93698b29de5e97ad0ae26447b344c482a7284c737d9ddc5f9e52b74a336671bb"
+dependencies = [
+ "chrono",
+ "chrono-tz-build",
+ "phf",
+]
+
+[[package]]
+name = "chrono-tz-build"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c088aee841df9c3041febbb73934cfc39708749bf96dc827e3359cd39ef11b1"
+dependencies = [
+ "parse-zoneinfo",
+ "phf",
+ "phf_codegen",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.20"
@@ -238,6 +285,66 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "cpufeatures"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "608697df725056feaccfa42cffdaeeec3fccc4ffc38358ecd19b243e716a78e0"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
+dependencies = [
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
+dependencies = [
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22ec99545bb0ed0ea7bb9b8e1e9122ea386ff8a48c0922e43f36d45ab09e0e80"
+
+[[package]]
+name = "crypto-common"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
+[[package]]
+name = "deunicode"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "339544cc9e2c4dc3fc7149fd630c5f22263a4fdf18a98afd0075784968b5cf00"
+
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+]
+
 [[package]]
 name = "encoding"
 version = "0.2.33"
@@ -406,12 +513,57 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "gimli"
 version = "0.31.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "07e28edb80900c19c28f1072f2e8aeca7fa06b23cd4169cefe1af5aa3260783f"
 
+[[package]]
+name = "globset"
+version = "0.4.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15f1ce686646e7f1e19bf7d5533fe443a45dbfb990e00629110797578b42fb19"
+dependencies = [
+ "aho-corasick",
+ "bstr",
+ "log",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "globwalk"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bf760ebf69878d9fd8f110c89703d90ce35095324d1f1edcb595c63945ee757"
+dependencies = [
+ "bitflags",
+ "ignore",
+ "walkdir",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -424,6 +576,15 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
+[[package]]
+name = "humansize"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6cb51c9a029ddc91b07a787f1d86b53ccfa49b0e86688c946ebe8d3555685dd7"
+dependencies = [
+ "libm",
+]
+
 [[package]]
 name = "iana-time-zone"
 version = "0.1.61"
@@ -447,12 +608,34 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "ignore"
+version = "0.4.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d89fd380afde86567dfba715db065673989d6253f42b88179abd3eae47bda4b"
+dependencies = [
+ "crossbeam-deque",
+ "globset",
+ "log",
+ "memchr",
+ "regex-automata",
+ "same-file",
+ "walkdir",
+ "winapi-util",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
 
+[[package]]
+name = "itoa"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
+
 [[package]]
 name = "js-sys"
 version = "0.3.72"
@@ -474,6 +657,12 @@ version = "0.2.161"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e9489c2807c139ffd9c1794f4af0ebe86a828db53ecdc7fea2111d0fed085d1"
 
+[[package]]
+name = "libm"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ec2a862134d2a7d32d7983ddcdd1c4923530833c9f2ea1a44fc5fa473989058"
+
 [[package]]
 name = "log"
 version = "0.4.22"
@@ -569,6 +758,15 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "parse-zoneinfo"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f2a05b18d44e2957b88f96ba460715e295bc1d7510468a2f3d3b44535d26c24"
+dependencies = [
+ "regex",
+]
+
 [[package]]
 name = "peazyrsa"
 version = "0.1.0"
@@ -584,9 +782,99 @@ dependencies = [
  "lazy_static",
  "openssl",
  "regex",
+ "tera",
  "tokio",
 ]
 
+[[package]]
+name = "percent-encoding"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
+
+[[package]]
+name = "pest"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "879952a81a83930934cbf1786752d6dedc3b1f29e8f8fb2ad1d0a36f377cf442"
+dependencies = [
+ "memchr",
+ "thiserror",
+ "ucd-trie",
+]
+
+[[package]]
+name = "pest_derive"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d214365f632b123a47fd913301e14c946c61d1c183ee245fa76eb752e59a02dd"
+dependencies = [
+ "pest",
+ "pest_generator",
+]
+
+[[package]]
+name = "pest_generator"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb55586734301717aea2ac313f50b2eb8f60d2fc3dc01d190eefa2e625f60c4e"
+dependencies = [
+ "pest",
+ "pest_meta",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pest_meta"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b75da2a70cf4d9cb76833c990ac9cd3923c9a8905a8929789ce347c84564d03d"
+dependencies = [
+ "once_cell",
+ "pest",
+ "sha2",
+]
+
+[[package]]
+name = "phf"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ade2d8b8f33c7333b51bcf0428d37e217e9f32192ae4772156f65063b8ce03dc"
+dependencies = [
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_codegen"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8d39688d359e6b34654d328e262234662d16cc0f60ec8dcbe5e718709342a5a"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48e4cc64c2ad9ebe670cb8fd69dd50ae301650392e81c05f9bfcb2d5bdbc24b0"
+dependencies = [
+ "phf_shared",
+ "rand",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90fcb95eef784c2ac79119d1dd819e162b5da872ce6f3c3abe1e8ca1c082f72b"
+dependencies = [
+ "siphasher",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.14"
@@ -605,6 +893,15 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "953ec861398dccce10c670dfeaf3ec4911ca479e9c02154b3a215178c5f566f2"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77957b295656769bb8ad2b6a6b09d897d94f05c41b069aede1fcdaa675eaea04"
+dependencies = [
+ "zerocopy",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.88"
@@ -623,6 +920,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "regex"
 version = "1.11.0"
@@ -658,6 +985,64 @@ version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
+[[package]]
+name = "ryu"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3cb5ba0dc43242ce17de99c180e96db90b235b8a9fdc9543c96d2209116bd9f"
+
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.213"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ea7893ff5e2466df8d720bb615088341b295f849602c6956047f8f80f0e9bc1"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.213"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e85ad2009c50b58e87caa8cd6dac16bdf511bbfb7af6c33df902396aa480fa5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.132"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d726bfaff4b320266d395898905d0eba0345aae23b54aee3a737e260fd46db03"
+dependencies = [
+ "itoa",
+ "memchr",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "sha2"
+version = "0.10.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
@@ -673,6 +1058,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "siphasher"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38b58827f4464d87d377d175e90bf58eb00fd8716ff0a62f80356b5e61555d0d"
+
 [[package]]
 name = "slab"
 version = "0.4.9"
@@ -682,6 +1073,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "slug"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "882a80f72ee45de3cc9a5afeb2da0331d58df69e4e7d8eeb5d3c7784ae67e724"
+dependencies = [
+ "deunicode",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -699,6 +1100,48 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tera"
+version = "1.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab9d851b45e865f178319da0abdbfe6acbc4328759ff18dafc3a41c16b4cd2ee"
+dependencies = [
+ "chrono",
+ "chrono-tz",
+ "globwalk",
+ "humansize",
+ "lazy_static",
+ "percent-encoding",
+ "pest",
+ "pest_derive",
+ "rand",
+ "regex",
+ "serde",
+ "serde_json",
+ "slug",
+ "unic-segment",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d11abd9594d9b38965ef50805c5e469ca9cc6f197f883f717e0269a3057b3d5"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
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+version = "1.0.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae71770322cbd277e69d762a16c444af02aa0575ac0d174f0b9562d3b37f8602"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tokio"
 version = "1.41.0"
@@ -726,6 +1169,68 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "a8c57a407d9b6fa02b4795eb81c5b6652060a15a7903ea981f3d723e6c0be221"
+dependencies = [
+ "unic-char-range",
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+
+[[package]]
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+
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+
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+checksum = "e4ed5d26be57f84f176157270c112ef57b86debac9cd21daaabbe56db0f88f23"
+dependencies = [
+ "unic-ucd-segment",
+]
+
+[[package]]
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+dependencies = [
+ "unic-char-property",
+ "unic-char-range",
+ "unic-ucd-version",
+]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "unic-common",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.13"
@@ -744,6 +1249,22 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "walkdir"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
+dependencies = [
+ "same-file",
+ "winapi-util",
+]
+
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -805,6 +1326,15 @@ version = "0.2.95"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "65fc09f10666a9f147042251e0dda9c18f166ff7de300607007e96bdebc1068d"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
+dependencies = [
+ "windows-sys",
+]
+
 [[package]]
 name = "windows-core"
 version = "0.52.0"
@@ -886,3 +1416,24 @@ name = "windows_x86_64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]

Cargo.toml

@@ -15,6 +15,7 @@ futures-util = "0.3.31"
 lazy_static = "1.5.0"
 openssl = { version="0.10.68" }
 regex = "1.11.0"
+tera = "1.20.0"
 tokio = { version = "1.41.0", features = ["fs", "rt", "process", "macros", "io-util"] }
 
 [profile.release]

src/common.rs

@@ -17,6 +17,9 @@ use futures_core::stream::Stream;
 
 pub(crate) type VarsMap = BTreeMap<String, String>;
 
+pub(crate) const UTF8_STR: &'static str = "utf8";
+pub(crate) const DEFAULT_ENCODING: &'static str = "cp866"; // .bat
+
 #[derive(Debug, Clone, PartialEq)]
 pub enum OpenSSLProviderArg {
     Internal,
@@ -100,7 +103,7 @@ pub(crate) struct AppConfig {
 impl Default for AppConfig {
     fn default() -> Self {
         Self {
-            encoding: "cp866".into(),
+            encoding: DEFAULT_ENCODING.into(),
             req_days: 30650,
             keys_subdir: "keys".into(),
             config_subdir: "config".into(),
@@ -177,7 +180,7 @@ where
     P: AsRef<Path>,
 {
     let filepath = PathBuf::from(filepath.as_ref());
-    if encoding == "utf8" {
+    if encoding == UTF8_STR {
         return Ok(fs::read_to_string(filepath).await?);
     }
 
@@ -188,8 +191,12 @@ where
         .map_err(|_| anyhow!("could not read file"))
 }
 
-pub(crate) async fn write_file(filepath: &PathBuf, text: String, encoding: &str) -> Result<()> {
+pub(crate) async fn write_file<P: AsRef<Path>>(
-    if encoding == "utf8" {
+    filepath: P,
+    text: String,
+    encoding: &str,
+) -> Result<()> {
+    if encoding == UTF8_STR {
         return Ok(fs::write(filepath, text).await?);
     }
 
@@ -201,11 +208,11 @@ pub(crate) async fn write_file(filepath: &PathBuf, text: String, encoding: &str)
     fs::write(filepath, bytes).await.context("can't write file")
 }
 
-pub(crate) async fn read_file_by_lines(
+pub(crate) async fn read_file_by_lines<P: AsRef<Path>>(
-    filepath: &PathBuf,
+    filepath: P,
     encoding: &str,
 ) -> Result<Box<dyn Stream<Item = String>>> {
-    Ok(if encoding == "utf8" {
+    Ok(if encoding == UTF8_STR {
         let f = File::open(filepath).await?;
         let reader = BufReader::new(f);
         let mut lines = reader.lines();

src/main.rs

@@ -5,6 +5,7 @@ mod certs;
 mod common;
 mod crypto_provider;
 mod openssl;
+mod ovpn;
 mod vars;
 
 use crate::certs::build_client_config;

src/ovpn.rs

@@ -0,0 +1,146 @@
+use std::path::{Path, PathBuf};
+
+use crate::common::{read_file, write_file, DEFAULT_ENCODING};
+use anyhow::{anyhow, Context, Result};
+use tera::Tera;
+
+pub(crate) struct OvpnConfig {
+    pub(crate) name: String,
+    pub(crate) encoding: String,
+    pub(crate) email: Option<String>,
+    pub(crate) template: String,
+    pub(crate) template_filename: Option<String>,
+    pub(crate) ca_cert: String,
+    pub(crate) cert: String,
+    pub(crate) key: String,
+}
+
+impl From<&OvpnConfig> for tera::Context {
+    fn from(value: &OvpnConfig) -> Self {
+        let mut context = tera::Context::new();
+        context.insert("name", &value.name);
+        context.insert("encoding", &value.encoding);
+        context.insert("email", &value.email);
+        context.insert("template_filename", &value.template_filename);
+        context.insert("ca_cert", &value.ca_cert);
+        context.insert("cert", &value.cert);
+        context.insert("key", &value.key);
+        context
+    }
+}
+
+#[derive(Debug, Default, Clone)]
+pub(crate) struct OvpnConfigBuilder {
+    name: String,
+    encoding: Option<String>,
+    email: Option<String>,
+    template_file: PathBuf,
+    ca_cert_file: Option<PathBuf>,
+    cert_file: Option<PathBuf>,
+    key_file: Option<PathBuf>,
+}
+
+impl OvpnConfigBuilder {
+    pub(crate) fn new<P: Into<PathBuf>>(name: String, template_file: P) -> Self {
+        Self {
+            name,
+            template_file: template_file.into(),
+            ..Default::default()
+        }
+    }
+    pub(crate) fn with_encoding(&mut self, encoding: String) -> &mut Self {
+        self.encoding = Some(encoding);
+        self
+    }
+    pub(crate) fn with_email(&mut self, email: String) -> &mut Self {
+        self.email = Some(email);
+        self
+    }
+    pub(crate) fn with_ca_cert_file<P: Into<PathBuf>>(&mut self, ca_cert_file: P) -> &mut Self {
+        self.ca_cert_file = Some(ca_cert_file.into());
+        self
+    }
+    pub(crate) fn with_cert_file<P: Into<PathBuf>>(&mut self, cert_file: P) -> &mut Self {
+        self.cert_file = Some(cert_file.into());
+        self
+    }
+    pub(crate) fn with_key_file<P: Into<PathBuf>>(&mut self, key_file: P) -> &mut Self {
+        self.key_file = Some(key_file.into());
+        self
+    }
+
+    pub(crate) async fn build(self) -> Result<OvpnConfig> {
+        let name = self.name;
+        let encoding = self.encoding.unwrap_or(DEFAULT_ENCODING.into());
+        let template = read_file(self.template_file.clone(), encoding.clone())
+            .await
+            .context("template file read error")?;
+        let ca_cert = read_file(
+            self.ca_cert_file.ok_or(anyhow!("ca cert file not set"))?,
+            encoding.clone(),
+        )
+        .await
+        .context("ca cert file read error")?;
+        let cert = read_file(
+            self.cert_file.ok_or(anyhow!("cert file not set"))?,
+            encoding.clone(),
+        )
+        .await
+        .context("cert file read error")?;
+        let key = read_file(
+            self.key_file.ok_or(anyhow!("key file not set"))?,
+            encoding.clone(),
+        )
+        .await
+        .context("key file read error")?;
+        let template_filename = self
+            .template_file
+            .file_name()
+            .ok_or(anyhow!("template_file filename"))?
+            .to_str()
+            .ok_or(anyhow!("template_file to_str"))?
+            .to_string();
+
+        Ok(OvpnConfig {
+            name,
+            encoding,
+            email: self.email,
+            template,
+            ca_cert,
+            cert,
+            key,
+            template_filename: Some(template_filename),
+        })
+    }
+}
+
+pub(crate) struct OvpnConfigRendered {
+    content: String,
+    encoding: String,
+}
+
+impl OvpnConfigRendered {
+    pub async fn to_file<P: AsRef<Path>>(self, filepath: P) -> Result<()> {
+        write_file(filepath, self.content, &self.encoding)
+            .await
+            .context("ovpn config file write error")
+    }
+}
+
+impl TryFrom<OvpnConfig> for OvpnConfigRendered {
+    type Error = anyhow::Error;
+
+    fn try_from(value: OvpnConfig) -> Result<Self> {
+        let mut tera = Tera::default();
+        tera.add_raw_template("template", &value.template)
+            .context("raw template add error")?;
+        let context: tera::Context = (&value).into();
+        let content = tera
+            .render("template", &context)
+            .context("config render error")?;
+        Ok(OvpnConfigRendered {
+            content,
+            encoding: value.encoding,
+        })
+    }
+}